Add Google Finance Integration

[joshuajyu]

This PR ports the Google Finance Tool from LangChain Python to LangChainJS. Google Finance Tool allows your agent to utilize the Google Finance API to retrieve financial data, such as stock prices, market trends, exchange rates, and other investment-related information from Google Finance. We've added/modified the following files:

• docs/core_docs/docs/integrations/tools/google_finance.mdx: Site docs
• examples/src/tools/google_finance.ts: Example usage
• libs/langchain-community/langchain.config.js: Added entrypoint for our tool
• libs/langchain-community/src/tools/google_finance.ts: The Google Finance Tool
• libs/langchain-community/src/tools/tests/google_finance.int.test.ts: Integration tests for the tool

Example Usage:

import { GoogleFinanceAPI } from "@langchain/community/tools/google_finance";
import { OpenAI } from "@langchain/openai";
import { initializeAgentExecutorWithOptions } from "langchain/agents";

export async function run() {
  const model = new OpenAI({
    temperature: 0,
    apiKey: process.env.OPENAI_API_KEY,
  });

  const tools = [new GoogleFinanceAPI()];

  const financeAgent = await initializeAgentExecutorWithOptions(tools, model, {
    agentType: "zero-shot-react-description",
    verbose: true,
  });

  const result = await financeAgent.invoke({
    input: "What is the price of GOOG:NASDAQ?",
  });

  console.log(result.output);
}

Sample Output:

{
  "markets": { … },
  "summary": {
    "title": "Alphabet Inc Class A",
    "stock": "GOOGL",
    "exchange": "NASDAQ",
    "price": "$89.23",
    "extracted_price": 89.23,
    "currency": "$",
    "price_movement": {
      "percentage": 1.6750242,
      "value": 1.4700012,
      "movement": "Up"
     }, … },
  "graph": [ … ],
  "knowledge_graph": { … },
  "news_results": [ … ],
  "financials": [ … ],
  "discover_more": [ … ]
} 

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[joshuajyu]

Hey @jacoblee93 , sorry to bother you but do you think you could re-review this when you get a chance? Thanks in advance!