Vectorset API improvements

[jotare]

Description

Describe the proposed changes made in this PR.

How was this PR tested?

Describe how you tested this PR.

[codecov]

Codecov Report

Attention: Patch coverage is 90.76923% with 6 lines in your changes missing coverage. Please review.

Project coverage is 86.77%. Comparing base (84d4c14) to head (9d64562).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
nucliadb/src/nucliadb/learning_proxy.py	25.00%	3 Missing ⚠️
nucliadb/src/nucliadb/writer/api/v1/vectorsets.py	95.08%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2836      +/-   ##
==========================================
- Coverage   86.78%   86.77%   -0.02%     
==========================================
  Files         380      379       -1     
  Lines       23879    23875       -4     
==========================================
- Hits        20724    20717       -7     
- Misses       3155     3158       +3     

Flag	Coverage Δ
nucliadb	75.22% <87.69%> (-0.02%)	⬇️
nucliadb-ingest	40.96% <20.00%> (-0.01%)	⬇️
nucliadb-reader	42.70% <20.00%> (-0.01%)	⬇️
nucliadb-search	44.16% <20.00%> (-0.01%)	⬇️
nucliadb-standalone	47.34% <20.00%> (-0.01%)	⬇️
nucliadb-train	45.49% <20.00%> (-0.01%)	⬇️
nucliadb-writer	46.78% <41.53%> (-0.02%)	⬇️
nucliadb_dataset	55.45% <ø> (ø)
nucliadb_sdk	83.13% <ø> (ø)
nucliadb_telemetry	86.56% <ø> (ø)
nucliadb_utils	83.79% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.