Generic distributed query algorithm

[jotare]

Description

Making some steps forward towards a generic distributed query algorithm that we can share across gRPC methods.

How was this PR tested?

Existing test suite

[codecov]

Codecov Report

❌ Patch coverage is 97.56098% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.37%. Comparing base (e6208d4) to head (3445466).

Files with missing lines	Patch %	Lines
nidx/src/searcher/grpc.rs	97.56%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3793      +/-   ##
==========================================
- Coverage   85.39%   85.37%   -0.03%     
==========================================
  Files         571      571              
  Lines       50467    50484      +17     
  Branches    15318    15335      +17     
==========================================
+ Hits        43096    43100       +4     
- Misses       6739     6749      +10     
- Partials      632      635       +3     

Flag	Coverage Δ
nidx	80.91% <97.56%> (+<0.01%)	⬆️
nucliadb	73.91% <ø> (-0.02%)	⬇️
nucliadb-ingest	43.85% <ø> (ø)
nucliadb-reader	43.71% <ø> (ø)
nucliadb-search	54.84% <ø> (ø)
nucliadb-standalone	46.03% <ø> (ø)
nucliadb-train	44.68% <ø> (ø)
nucliadb-writer	47.18% <ø> (-0.08%)	⬇️
nucliadb_dataset	73.40% <ø> (ø)
nucliadb_models	69.72% <ø> (ø)
nucliadb_sdk	82.28% <ø> (ø)
nucliadb_telemetry	85.67% <ø> (ø)
nucliadb_utils	80.87% <ø> (ø)

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