community: Add stock market tools from financialdatasets.ai (#25025)

**Description:**
In this PR, I am adding three stock market tools from
financialdatasets.ai (my API!):
- get balance sheets
- get cash flow statements
- get income statements

Twitter handle: [@virattt](https://twitter.com/virattt)

---------

Co-authored-by: Erick Friis <erick@langchain.dev>

libs/community/langchain_community/agent_toolkits/financial_datasets/__init__.py

@@ -0,0 +1 @@
+"""financial datasets toolkit."""

libs/community/langchain_community/agent_toolkits/financial_datasets/toolkit.py

@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+from typing import List
+
+from langchain_core.pydantic_v1 import Field
+from langchain_core.tools import BaseToolkit
+
+from langchain_community.tools import BaseTool
+from langchain_community.tools.financial_datasets.balance_sheets import BalanceSheets
+from langchain_community.tools.financial_datasets.cash_flow_statements import (
+    CashFlowStatements,
+)
+from langchain_community.tools.financial_datasets.income_statements import (
+    IncomeStatements,
+)
+from langchain_community.utilities.financial_datasets import FinancialDatasetsAPIWrapper
+
+
+class FinancialDatasetsToolkit(BaseToolkit):
+    """Toolkit for interacting with financialdatasets.ai.
+
+    Parameters:
+        api_wrapper: The FinancialDatasets API Wrapper.
+    """
+
+    api_wrapper: FinancialDatasetsAPIWrapper = Field(
+        default_factory=FinancialDatasetsAPIWrapper
+    )
+
+    def __init__(self, api_wrapper: FinancialDatasetsAPIWrapper):
+        super().__init__()
+        self.api_wrapper = api_wrapper
+
+    class Config:
+        """Pydantic config."""
+
+        arbitrary_types_allowed = True
+
+    def get_tools(self) -> List[BaseTool]:
+        """Get the tools in the toolkit."""
+        return [
+            BalanceSheets(api_wrapper=self.api_wrapper),
+            CashFlowStatements(api_wrapper=self.api_wrapper),
+            IncomeStatements(api_wrapper=self.api_wrapper),
+        ]