Add a StdIn "Interaction" Tool (#1193)

Lets a chain prompt the user for more input as a part of its execution.

langchain/tools/interaction/__init__.py

@@ -0,0 +1 @@
+"""Tools for interacting with the user."""

langchain/tools/interaction/tool.py

@@ -0,0 +1,22 @@
+"""Tools for interacting with the user."""
+
+
+from langchain.tools.base import BaseTool
+
+
+class StdInInquireTool(BaseTool):
+    """Tool for asking the user for input."""
+
+    name: str = "Inquire"
+    description: str = (
+        "useful if you do not have enough information to"
+        " effectively use other tools. Input is best as a clarifying"
+        " question (to disambiguate) or a request for more context."
+    )
+
+    def _run(self, prompt: str) -> str:
+        """Prompt the user for more input."""
+        return input(f"\n{prompt}")
+
+    async def _arun(self, query: str) -> str:
+        raise NotImplementedError(f"{self.__class__.__name__} does not support async")