Add MongoDBAtlasDocumentStore

[mathislucka]

Summary and motivation

Similar to 1.x we'd like to have a document store for MongoDB's Atlas.

Checklist

If the request is accepted, ensure the following checklist is complete before closing this issue.

• The code was merged in the main branch:
  • Docstore itself: feat: MongoDBAtlas Document Store #413
  • First retriever: feat: MongoDBAtlasEmbeddingRetriever #427
  • Filtering:
• Docs are published at https://docs.haystack.deepset.ai/: Draft at https://www.notion.so/deepsetai/MongoDBAtlasDocumentStore-WIP-e2b17f3079804ac6a69384789f83b2ce
• There is a Github workflow running the tests for the integration nightly and at every PR: feat: MongoDBAtlas Document Store #413
• A label named like integration:<your integration name> has been added to this repo
• The labeler.yml file has been updated: feat: MongoDBAtlas Document Store #413
• The package has been released on PyPI
• An integration tile has been added to https://github.com/deepset-ai/haystack-integrations: MongoDB Atlas support in Haystack 2.0 haystack-integrations#180
• The integration has been listed in the Inventory section of this repo README: feat: MongoDBAtlas Document Store #413
• There is an example available to demonstrate the feature: feat: MongoDBAtlas Document Store #413
• The feature was announced through social media

[anakin87]

Filters implemented and new version released.