Support synchronous chat response

[vangheem]

Description

Allow synchronous chat responses.

This includes a refactor to make supporting this more tenable

How was this PR tested?

Describe how you tested this PR.

[shortcut-integration]

This pull request has been linked to Shortcut Story #7131: Option to get the /chat response in one go.

[codecov]

Codecov Report

Patch coverage: 99.28% and project coverage change: +0.11% 🎉

Comparison is base (7bdaa03) 85.08% compared to head (d0ea553) 85.20%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1331      +/-   ##
==========================================
+ Coverage   85.08%   85.20%   +0.11%     
==========================================
  Files         414      415       +1     
  Lines       22885    22922      +37     
==========================================
+ Hits        19472    19530      +58     
+ Misses       3413     3392      -21     

Flag	Coverage Δ
ingest	74.91% <ø> (ø)
nucliadb	65.82% <93.52%> (+0.20%)	⬆️
reader	74.08% <ø> (ø)
sdk	42.51% <ø> (ø)
search	83.83% <54.68%> (+0.17%)	⬆️
standalone	82.97% <ø> (ø)
train	60.25% <ø> (ø)
utils	84.63% <ø> (ø)
writer	84.94% <ø> (ø)

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Files Changed	Coverage Δ
nucliadb/nucliadb/search/search/find.py	95.83% <95.83%> (ø)
nucliadb/nucliadb/search/api/v1/chat.py	98.03% <100.00%> (ø)
nucliadb/nucliadb/search/api/v1/find.py	97.36% <100.00%> (+0.75%)	⬆️
nucliadb/nucliadb/search/api/v1/resource/chat.py	96.00% <100.00%> (+41.83%)	⬆️
nucliadb/nucliadb/search/search/chat/query.py	95.52% <100.00%> (+2.34%)	⬆️
...adb/search/tests/unit/api/v1/resource/test_chat.py	95.83% <100.00%> (ø)
...adb/nucliadb/search/tests/unit/api/v1/test_chat.py	95.83% <100.00%> (ø)
...search/tests/unit/search/search/chat/test_query.py	100.00% <100.00%> (ø)
nucliadb/nucliadb/tests/integration/test_chat.py	96.20% <100.00%> (+0.61%)	⬆️

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