feat: accept chunks as arguments to chat.{start,append,stop}Stream methods

[srtaalej]

Summary

This PR introduces the chunks argument to the following methods:

chat.startStream
chat.appendStream
chat.stopStream

⚠️ This feature is experimental at the moment!

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 93.09%. Comparing base (b44cee1) to head (2601199).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                     Coverage Diff                      @@
##           feat-ai-apps-thinking-steps    #2467   +/-   ##
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  Coverage                        93.09%   93.09%           
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  Files                               40       40           
  Lines                            11240    11240           
  Branches                           713      713           
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  Hits                             10464    10464           
  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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