feat: slack webhook handler

[jayhack]

Enables the following syntax:

app = CodegenApp(name="slack-test", image=base_image, modal_api_key='')

# Runs on app mention events
@app.slack.event('app_mention')
def handle_mention(client: WebClient, event: SlackEvent):
    output = client.chat_postMessage(
        thread_ts=event.ts,
        text="Hello, world!",
        channel=event.channel
    )
    return {"message": "Event handled successfully"}

# Have to put this at the end
@app.function(secrets=[modal.Secret.from_dotenv()])
@modal.web_endpoint(method="POST")
def entrypoint(event: SlackWebhookPayload):
    app.slack.handle(event)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

Additional details and impacted files

[github-actions]

🎉 This PR is included in version 0.18.0 🎉

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