feat: add ai-enabled features text streaming methods, feedback blocks, and loading state

[zimeg]

Release Notes

🍿 https://github.com/slackapi/bolt-python/releases/tag/v1.26.0

Summary

This PR surfaces the AI-enabled features from the SDK release 3.37.0 in slackapi/python-slack-sdk#1766 and makes the following improvements to bolt:

• Markdown text: The markdown_text argument is accepted in the say helper
• Loading messages: The assistant.threads.setStatus method accepts optional loading messages.
• Suggested prompts: The set_suggested_prompts helper accepts a sequence of prompts instead of a list now.

Testing

In CI and all PRs prior 🤖

Category

• slack_bolt.App and/or its core components
• slack_bolt.async_app.AsyncApp and/or its core components
• Document pages under /docs

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run ./scripts/install_all_and_run_tests.sh after making the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.03%. Comparing base (95150b8) to head (ca89676).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@## main #1387 +/- ##
==========================================
+ Coverage 91.00% 91.03% +0.02% 
==========================================
Files 222 222 Lines 7512 7514 +2 ==========================================
+ Hits 6836 6840 +4 + Misses 676 674 -2 

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[mwbrooks]

✅ Looks good to me!

📝 Thanks for the co-author on the dependency bump 😄

[mwbrooks]

praise: This looks good!

[zimeg]

@mwbrooks@srtaalej Thank y'all both so much for the fast finds on this. I'dve been bothered if this landed and we'dve found out later...

So now let's merge this! 🎉