More complex field extension

[lferran]

Description

[sc-13251]

How was this PR tested?

• todo

[codecov]

Codecov Report

❌ Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.96%. Comparing base (efaba96) to head (bcf3c24).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
nucliadb/src/nucliadb/search/search/chat/prompt.py	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3352      +/-   ##
==========================================
- Coverage   85.99%   85.96%   -0.04%     
==========================================
  Files         530      530              
  Lines       43476    43488      +12     
  Branches    12104    12104              
==========================================
- Hits        37389    37386       -3     
- Misses       5503     5513      +10     
- Partials      584      589       +5     

Flag	Coverage Δ
nidx	79.51% <ø> (-0.12%)	⬇️
nucliadb	74.95% <95.83%> (+<0.01%)	⬆️
nucliadb-ingest	45.17% <25.00%> (-0.01%)	⬇️
nucliadb-reader	44.88% <25.00%> (-0.01%)	⬇️
nucliadb-search	49.18% <25.00%> (-0.01%)	⬇️
nucliadb-standalone	48.02% <25.00%> (-0.01%)	⬇️
nucliadb-train	45.66% <25.00%> (-0.01%)	⬇️
nucliadb-writer	48.75% <25.00%> (-0.01%)	⬇️
nucliadb_dataset	75.81% <60.00%> (ø)
nucliadb_models	79.73% <100.00%> (ø)
nucliadb_sdk	85.30% <100.00%> (ø)
nucliadb_telemetry	82.91% <ø> (ø)
nucliadb_utils	81.61% <ø> (ø)

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[jotare]

We'll need to add this to Hydrate API too