Allow using Pydantic v2

[ninoseki]

The latest version of FastAPI (v0.100.0) supports Pydantic v2.

• https://docs.pydantic.dev/2.0/

I'd like to use redis-om-python with Pydantic v2 while keeping the compatibility.

This PR does:

• Allow using Pydantic v2 (pydantic = ">=1.10.2,<2.1.0")
• Add _compat.py file to import proper Pydantic classes, etc.
  • Do from pydantic import ... if Pydantic is v1
  • Do from pydantic.v1 import ... if Pydantic is v2 (Note: Pydantic v2 contains v1 in v1 module)

It allows using Pydantic v2 along with redis-om-python.

[ninoseki]

There are lint & dependency audit errors.

I'm sure the lint error is out of the scope of this PR.

/home/runner/.local/bin/poetry run mypy ./tests/ aredis_om redis_om --ignore-missing-imports --exclude _compat\.py$
redis_om/model/cli/migrate.py:6: error: Argument 1 has incompatible type "Callable[[Any], Any]"; expected <nothing>
aredis_om/model/cli/migrate.py:6: error: Argument 1 has incompatible type "Callable[[Any], Any]"; expected <nothing>

I'm not sure about the audit error. Could you help me to fix the issue, please? (If this PR looks good)

[codecov-commenter]

Codecov Report

Patch coverage: 68.42% and project coverage change: -0.33 ⚠️

Comparison is base (70f6401) 78.94% compared to head (099ca96) 78.61%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #533      +/-   ##
==========================================
- Coverage   78.94%   78.61%   -0.33%     
==========================================
  Files          14       15       +1     
  Lines        1178     1188      +10     
==========================================
+ Hits          930      934       +4     
- Misses        248      254       +6     

Flag	Coverage Δ
unit	78.61% <68.42%> (-0.33%)	⬇️

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

Impacted Files	Coverage Δ
aredis_om/_compat.py	60.00% <60.00%> (ø)
aredis_om/model/encoders.py	50.70% <100.00%> (-0.69%)	⬇️
aredis_om/model/model.py	87.03% <100.00%> (-0.06%)	⬇️

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[chayim]

@ninoseki I've merged master in accordingly.

[ninoseki]

Thanks and please let me know if I need additional works on this PR.

[chayim]

given the opt in nature - and the pydantic changes.. it seems very clean.