Added call method and dialog turn to memory class, added 3 memory tests [issue #248]

[lu-ny]

What does this PR do?

Fixes #248

Added a call method to the unfinished adalflow.components.memory.memory.Memory class. This method returns a formatted conversation history, handles empty conversations, and formats user and assistant messages.

Additionally, added add_dialog_turn() method to handle new back-and-forth messages. This adds an id to each dialog turn for tracking and appends it to the current_conversation list.

Finally, added 3 new tests for memory -empty memory, single dialog turn, and multiple dialog turn tests. Also updated the chatbot usage notebook to replace the deprecated class with the updated one and verified that it worked.

Submission Details

• Was this discussed/agreed via a GitHub issue? (not for typos and docs)
• Did you read the contributor guideline?
• Did you make sure your PR does only one thing, instead of bundling different changes together?
• Did you make sure to update the documentation with your changes? (if necessary)
• Did you write any new necessary tests? (not for typos and docs)
• Did you verify new and existing tests pass locally with your changes?
• Did you list all the breaking changes introduced by this pull request?

Test Results

======================================================== test session starts ========================================================
platform linux -- Python 3.11.9, pytest-8.3.3, pluggy-1.5.0
rootdir: /home/AdalFlow
configfile: pyproject.toml
plugins: mock-3.14.0, anyio-4.4.0
collected 209 items / 1 skipped                                                                                                     

adalflow/tests/test_AzureClient.py ..                                                                                         [  0%]
adalflow/tests/test_base_data_class.py ..............                                                                         [  7%]
adalflow/tests/test_component.py ...                                                                                          [  9%]
adalflow/tests/test_data.py ...                                                                                               [ 10%]
adalflow/tests/test_data_class_parser.py ......                                                                               [ 13%]
adalflow/tests/test_data_classes.py ....                                                                                      [ 15%]
adalflow/tests/test_data_loader.py .......                                                                                    [ 18%]
adalflow/tests/test_dataclass_object_functions.py ................                                                            [ 26%]
adalflow/tests/test_evaluators.py ..s                                                                                         [ 27%]
adalflow/tests/test_faiss_retriever.py .........                                                                              [ 32%]
adalflow/tests/test_function_expression_parse.py ........................                                                     [ 43%]
adalflow/tests/test_generator.py .....                                                                                        [ 45%]
adalflow/tests/test_generator_call_logger.py ...                                                                              [ 47%]
adalflow/tests/test_grad_component.py ......                                                                                  [ 50%]
adalflow/tests/test_groq_client.py ..                                                                                         [ 51%]
adalflow/tests/test_lazy_import.py ........                                                                                   [ 55%]
adalflow/tests/test_logger.py ......                                                                                          [ 57%]
adalflow/tests/test_memory.py ...                                                                                             [ 59%]
adalflow/tests/test_model_client.py ...                                                                                       [ 60%]
adalflow/tests/test_ollama_client.py ..                                                                                       [ 61%]
adalflow/tests/test_openai_client.py ..                                                                                       [ 62%]
adalflow/tests/test_output_parser.py ......                                                                                   [ 65%]
adalflow/tests/test_parameter.py ............                                                                                 [ 71%]
adalflow/tests/test_parameter_text_grad.py ...                                                                                [ 72%]
adalflow/tests/test_random_sample.py .....                                                                                    [ 75%]
adalflow/tests/test_sequential.py ...............                                                                             [ 82%]
adalflow/tests/test_string_parser.py ..........................                                                               [ 94%]
adalflow/tests/test_text_splitter.py .........                                                                                [ 99%]
adalflow/tests/test_tool.py ..                                                                                                [100%]

========================================================= warnings summary ==========================================================
adalflow/tests/test_ollama_client.py::TestOllamaModelClient::test_ollama_embedding_client
adalflow/tests/test_ollama_client.py::TestOllamaModelClient::test_ollama_llm_client
  /home/AdalFlow/adalflow/adalflow/components/model_client/ollama_client.py:165: UserWarning: Better to provide host or set OLLAMA_HOST env variable. We will use the default host http://localhost:11434 for now.
    warnings.warn(

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
============================================ 208 passed, 2 skipped, 2 warnings in 11.53s ============================================

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[lu-ny]

@fm1320 @liyin2015 lmk when you get a chance to review :)

[fm1320]

Yeah it looks all good, made some small edits in the notebook but its fine :) thanks @lu-ny