feat: add task display mode option to start of chat streams

[srtaalej]

Summary

This PR adds the task_display_mode option to the start of chat streams.

const stream = new ChatStreamer(client, client.logger,
  {
    channel: 'C1234',
    thread_ts: '1234.56',
    chunks: [
      {
        type: 'markdown_text',
        text: 'Hello world',
      },
    ],
    recipient_team_id: 'T1234',
    recipient_user_id: 'U1234',
    task_display_mode: 'timeline'
  },
);

Requirements (place an x in each [ ])

• 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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.07%. Comparing base (16f377d) to head (0cd39dd).
⚠️ Report is 1 commits behind head on feat-ai-apps-thinking-steps.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                     Coverage Diff                      @@
##           feat-ai-apps-thinking-steps    #2479   +/-   ##
============================================================
  Coverage                        93.07%   93.07%           
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  Files                               40       40           
  Lines                            11213    11213           
  Branches                           708      708           
============================================================
  Hits                             10437    10437           
  Misses                             764      764           
  Partials                            12       12           

Flag	Coverage Δ
cli-hooks	95.23% <ø> (ø)
cli-test	94.79% <ø> (ø)
webhook	96.66% <ø> (ø)

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[zimeg]

@srtaalej LGTM! Thanks for a fast fix to stacked issues prior 🙏 ✨

[mwbrooks]

⚠️ There are failing tests due to a linter issue. I've left a suggestion that should fix it (confirmed locally).

✅ Thanks for adding the task_display_mode support so quickly! 🙌🏻 We're starting to feel feature complete!

🧪 I've ran the test locally (see my suggestion to fix the error) and tested manually with a sample app, which works great! 👏🏻

[mwbrooks]

praise: Really like this description!