key value date support

[javitonino]

Description

Describe the proposed changes made in this PR.

How was this PR tested?

Describe how you tested this PR.

[codecov]

Codecov Report

❌ Patch coverage is 94.88636% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.21%. Comparing base (af8bde9) to head (12fc476).

Files with missing lines	Patch %	Lines
nidx/src/searcher/query_planner.rs	0.00%	7 Missing ⚠️
nucliadb_models/src/nucliadb_models/filters.py	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3653      +/-   ##
==========================================
+ Coverage   85.19%   85.21%   +0.02%     
==========================================
  Files         563      563              
  Lines       48465    48633     +168     
  Branches    14173    14300     +127     
==========================================
+ Hits        41288    41443     +155     
- Misses       6559     6571      +12     
- Partials      618      619       +1     

Flag	Coverage Δ
nidx	79.84% <94.69%> (+0.09%)	⬆️
nucliadb	73.54% <95.45%> (-0.01%)	⬇️
nucliadb-ingest	43.56% <27.27%> (-0.03%)	⬇️
nucliadb-reader	43.62% <27.27%> (-0.03%)	⬇️
nucliadb-search	54.67% <43.18%> (-0.03%)	⬇️
nucliadb-standalone	45.97% <27.27%> (-0.05%)	⬇️
nucliadb-train	44.64% <27.27%> (-0.03%)	⬇️
nucliadb-writer	46.91% <27.27%> (-0.02%)	⬇️
nucliadb_dataset	73.62% <68.75%> (-0.03%)	⬇️
nucliadb_models	71.52% <68.75%> (-0.03%)	⬇️
nucliadb_sdk	83.00% <68.75%> (-0.08%)	⬇️
nucliadb_telemetry	72.33% <ø> (ø)
nucliadb_utils	80.94% <ø> (ø)

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