feat: Adjust the PatchOp model

[Meow-Knight]

Enhance the PatchOp model with stricter validation and include two new contexts for the Patch action.

>>> from scim2_models.rfc7644.patch_op import PatchOp
>>> patch_instance = PatchOp.model_validate(dict(schemas=["abcd1234", "1234abcd"]))
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "D:\Bohi\scim2-models\scim2_models\base.py", line 808, in model_validate
    return super().model_validate(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Bohi\scim2-models\venv\Lib\site-packages\pydantic\main.py", line 703, in model_validate
    return cls.__pydantic_validator__.validate_python(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pydantic_core._pydantic_core.ValidationError: 2 validation errors for PatchOp
schemas
  Value error, `schemas` must be exactly ['urn:ietf:params:scim:api:messages:2.0:PatchOp'] [type=value_error, input_value=['abcd1234', '1234abcd'], input_type=list]
    For further information visit https://errors.pydantic.dev/2.11/v/value_error
operations
  Field required [type=missing, input_value={'schemas': ['abcd1234', '1234abcd']}, input_type=dict]
    For further information visit https://errors.pydantic.dev/2.11/v/missing

[Meow-Knight]

Hi @azmeuk I opened this PR for the issue. Please help me review it.
One more thing I’d like to mention: one test case failed after my changes:

• LOC

Do you have any thoughts on this?
Should I go ahead and update the test case as well?

[Meow-Knight]

@azmeuk I just corrected my PR and it passed all the checks. Please help me review it. Thanks

[azmeuk]

Thank you for your contribution!