Validate UUID middleware

[lferran]

Description

Add middleware to validare uuid for resources and kbids and return a 404

How was this PR tested?

Describe how you tested this PR.

[codecov]

Codecov Report

❌ Patch coverage is 94.54545% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.37%. Comparing base (f37ba0c) to head (f293593).

Files with missing lines	Patch %	Lines
nucliadb/src/nucliadb/middleware/__init__.py	96.00%	2 Missing ⚠️
nucliadb/src/nucliadb/train/app.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3815      +/-   ##
==========================================
- Coverage   85.40%   85.37%   -0.04%     
==========================================
  Files         572      572              
  Lines       50580    50629      +49     
  Branches    15354    15354              
==========================================
+ Hits        43200    43225      +25     
- Misses       6746     6769      +23     
- Partials      634      635       +1     

Flag	Coverage Δ
nidx	80.92% <ø> (-0.01%)	⬇️
nucliadb	74.49% <94.54%> (+0.45%)	⬆️
nucliadb-ingest	43.77% <29.09%> (-0.04%)	⬇️
nucliadb-reader	43.77% <89.09%> (+0.06%)	⬆️
nucliadb-search	54.87% <89.09%> (+0.04%)	⬆️
nucliadb-standalone	46.11% <94.54%> (+0.08%)	⬆️
nucliadb-train	44.74% <87.27%> (+0.06%)	⬆️
nucliadb-writer	47.23% <87.27%> (+0.05%)	⬆️
nucliadb_dataset	73.41% <ø> (ø)
nucliadb_models	69.70% <ø> (ø)
nucliadb_sdk	82.29% <ø> (ø)
nucliadb_telemetry	85.67% <ø> (ø)
nucliadb_utils	80.54% <ø> (ø)

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