Integrate datasets crud endpoints

[frascuchon]

This PR integrates new DB logic and policies with the current implementation.

• The main changes are applied to the dataset service class
• The auth.get_current_user returns a models.User instance
• The ONLY change in endpoints is using this new auth.get_current_user method

In a separate PR the pydantic User class will be cleaned and normalized

[codecov]

Codecov Report

Patch coverage: 90.38% and project coverage change: +0.80 🎉

Comparison is base (8c05058) 92.74% compared to head (165852c) 93.54%.

Additional details and impacted files

@@                         Coverage Diff                         @@
##           feat/add-basic-database-support    #2510      +/-   ##
===================================================================
+ Coverage                            92.74%   93.54%   +0.80%     
===================================================================
  Files                                  167      163       -4     
  Lines                                 8271     8217      -54     
===================================================================
+ Hits                                  7671     7687      +16     
+ Misses                                 600      530      -70     

Flag	Coverage Δ
pytest	93.54% <90.38%> (+0.80%)	⬆️

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

Impacted Files	Coverage Δ
src/argilla/client/api.py	95.34% <ø> (ø)
src/argilla/client/sdk/text_classification/api.py	100.00% <ø> (+12.90%)	⬆️
src/argilla/server/apis/v0/handlers/metrics.py	97.50% <ø> (ø)
src/argilla/server/apis/v0/handlers/records.py	100.00% <ø> (ø)
.../argilla/server/apis/v0/handlers/records_update.py	100.00% <ø> (ø)
...rc/argilla/server/daos/backend/mappings/helpers.py	97.22% <ø> (ø)
src/argilla/tasks/users/migrate.py	100.00% <ø> (ø)
src/argilla/client/apis/datasets.py	92.62% <78.57%> (-4.58%)	⬇️
src/argilla/server/services/datasets.py	90.35% <82.45%> (-5.53%)	⬇️
src/argilla/client/client.py	93.07% <84.61%> (+6.25%)	⬆️
... and 26 more

... and 2 files with indirect coverage changes

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