Upgrade to pydantic v2

[gmmajal]

Related to: #18

The migration to pydantic v2 is based on https://docs.pydantic.dev/latest/migration/

The following changes have been introduced in qualle:

• root_validator is replaced with model_validator. More info here: https://docs.pydantic.dev/latest/migration/#validator-and-root_validator-are-deprecated. The recommended syntax is provided here: https://docs.pydantic.dev/latest/concepts/validators/#model-validators.
• AnyUrl now does not inherit from class String (see here: https://docs.pydantic.dev/latest/migration/#url-and-dsn-types-in-pydanticnetworks-no-longer-inherit-from-str). It is now replaced with a workaround solution (see here: AnyUrl adds trailing slash pydantic/pydantic#7186 (comment)).
• BaseSettings is imported from a different location. The package pydantic-settings has been added inside the pyproject.toml file. BaseSettings is imported from pydantic_settings for pydantic v2. More info here: https://docs.pydantic.dev/latest/migration/#basesettings-has-moved-to-pydantic-settings.
• In one instance Optional[Type] is provided a default value of None. More info here: https://docs.pydantic.dev/latest/migration/#required-optional-and-nullable-fields.
• Additional unit tests have been added to verify model validation behavior.
  • The unit tests can be found inside interface/test_config.py and test_models.py
• In order to avoid deprecation errors, .dict() and .json() are replaced with model_dump() and model_dump_json(), respectively. More info here: https://docs.pydantic.dev/latest/migration/#changes-to-pydanticbasemodel
• An assertion error was being raised inside interface/test_internal.py. The dummy subthesauri have now been modified to have a lowercase URI.

[gmmajal]

Some refactoring had to be made to comply with our linters in particular black. A change has been made in github actions with regards to flake8. It will ignore lengthy lines (E501).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.54%. Comparing base (3c2be3b) to head (ec7b91e).
Report is 21 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   94.40%   94.54%   +0.13%     
==========================================
  Files          23       23              
  Lines         894      898       +4     
==========================================
+ Hits          844      849       +5     
+ Misses         50       49       -1     

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[gmmajal]

The changes from the main branch have been pulled into this feature branch. A new poetry.lock file has been created.

[gmmajal]

Removed the ignore command from the flake8 job present inside .github/workflows

[gmmajal]

Post request is working on the local instance of qualle. A new unit test has been added to verify the status 422 behavior of our rest api as specified in the openapi.json file.