[ENH]: Adopt Pydantic for schema validation

[synchon]

Are you requiring a new dataset or marker?

• I understand this is not a marker or dataset request

Which feature do you want to include?

We want to be able to validate the yaml so we avoid issues like #296

How do you imagine this integrated in junifer?

Use pydantic and validate the yaml.

Do you have a sample code that implements this outside of junifer?

No response

Anything else to say?

No response

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (5abcacf) to head (df9cc95).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #364      +/-   ##
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+ Coverage   91.64%   100.00%   +8.35%     
===========================================
  Files         146         1     -145     
  Lines        5862         1    -5861     
  Branches      934         0     -934     
===========================================
- Hits         5372         1    -5371     
+ Misses        318         0     -318     
+ Partials      172         0     -172     

Flag	Coverage Δ
docs	100.00% <ø> (ø)
junifer	?

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Files with missing lines	Coverage Δ
docs/conf.py	100.00% <ø> (ø)

... and 144 files with indirect coverage changes

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[github-actions]

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[synchon]

CI passes on juseless.

[synchon]

@fraimondo I have run quite a few of the YAMLs I have, would appreciate if you could run a couple of your most-used YAMLs with this branch. The YAMLs might require minimal changes which should be evident from the error raised.