feat(community): Add Slack Tool

[MadisonMajarais]

This PR adds a new Slack Tool that helps users to perform the following actions in Slack channels:

• Get/Search messages
• Get Channel Information
• Post a new message
• Schedule a new message

This PR helps to align LangChain.js with the Slack tool in LangChain (python).

Discussion # #7134

Example Usage:

let res = await agentExecutor.invoke({
  messages: [
    new HumanMessage("send a greeting message to the general channel"),
  ],
});

console.log(res.output);

res = await agentExecutor.invoke({
  messages: [
    new HumanMessage("Schedule a greeting message to the general channel at 11:15 am on December 12, 2024 in New York time."),
  ],
});

console.log(res.output);

res = await agentExecutor.invoke({
  messages: [
    new HumanMessage("When did I say 'hi' in the slack channels?"),
  ],
});

console.log(res.output);```

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[jacoblee93]

Thanks!

[jacoblee93]

Can you use the proper template from here?

https://github.com/langchain-ai/langchainjs/tree/main/libs/langchain-scripts/src/cli/docs/templates

[jacoblee93]

Use the createReactAgent method from @langchain/langgraph