Store extracted text in nidx

[jotare]

Description

Object storage response time for extracted text blobs is around 50-200ms depending on the region, activity... This is a first approach towards storing the text in nidx, which provides response times in the order or µs inside nidx and ~10ms for a gRPC call (mostly network).

This is a quite naive implementation and many things can be improved

How was this PR tested?

Describe how you tested this PR.

[codecov]

Codecov Report

❌ Patch coverage is 21.48438% with 201 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.26%. Comparing base (0c43f8f) to head (d1bf5ca).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
nidx/nidx_text/src/lib.rs	0.00%	48 Missing ⚠️
nidx/nidx_text/src/reader.rs	0.00%	48 Missing ⚠️
nidx/src/searcher/shard_text.rs	0.00%	47 Missing ⚠️
nucliadb/src/nucliadb/common/cache.py	33.33%	20 Missing ⚠️
nucliadb/src/nucliadb/search/search/paragraphs.py	41.17%	20 Missing ⚠️
...cliadb_utils/src/nucliadb_utils/featureflagging.py	60.00%	10 Missing ⚠️
nidx/src/api/shards.rs	60.00%	1 Missing and 1 partial ⚠️
nidx/src/searcher/grpc.rs	0.00%	2 Missing ⚠️
nidx/nidx_text/src/schema.rs	75.00%	1 Missing ⚠️
nidx/src/api/grpc.rs	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3588      +/-   ##
==========================================
- Coverage   85.62%   85.26%   -0.36%     
==========================================
  Files         551      552       +1     
  Lines       46872    47099     +227     
  Branches    13293    13448     +155     
==========================================
+ Hits        40133    40161      +28     
- Misses       6151     6348     +197     
- Partials      588      590       +2     

Flag	Coverage Δ
nidx	79.77% <5.69%> (-0.91%)	⬇️
nucliadb	72.97% <46.93%> (-0.09%)	⬇️
nucliadb-ingest	43.59% <30.61%> (-0.04%)	⬇️
nucliadb-reader	43.65% <30.61%> (-0.06%)	⬇️
nucliadb-search	53.96% <43.87%> (-0.06%)	⬇️
nucliadb-standalone	46.06% <30.61%> (-0.02%)	⬇️
nucliadb-train	44.70% <30.61%> (-0.04%)	⬇️
nucliadb-writer	47.01% <30.61%> (-0.04%)	⬇️
nucliadb_dataset	73.76% <ø> (ø)
nucliadb_models	71.63% <ø> (ø)
nucliadb_sdk	83.49% <ø> (ø)
nucliadb_telemetry	82.74% <ø> (-0.18%)	⬇️
nucliadb_utils	80.61% <55.55%> (-0.19%)	⬇️

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