Add summary_kind to /summarize endpoint

[jotare]

Story details: https://app.shortcut.com/flaps/story/8629

[shortcut-integration]

This pull request has been linked to Shortcut Story #8629: Add summary_kind to /summarize endpoint.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (66baf3f) 82.13% compared to head (e143f52) 82.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1764      +/-   ##
==========================================
- Coverage   82.13%   82.11%   -0.03%     
==========================================
  Files         336      336              
  Lines       19674    19675       +1     
==========================================
- Hits        16160    16156       -4     
- Misses       3514     3519       +5     

Flag	Coverage Δ
ingest	69.07% <ø> (ø)
nucliadb	70.21% <100.00%> (-0.06%)	⬇️
reader	79.05% <ø> (ø)
sdk	40.58% <ø> (ø)
standalone	88.29% <ø> (ø)
train	63.71% <ø> (ø)
utils	81.42% <ø> (ø)
writer	85.15% <ø> (ø)

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