Add masking strategy override to FidesMeta

[Linker44]

Closes #

Description Of Changes

Add new field called masking_strategy_override to FidesMeta

Code Changes

• Added FieldMaskingOverride class
• edited Field class to have a masking_strategy_override attribute

Steps to Confirm

• list any manual steps taken to confirm the changes

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation Updated
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md

[NevilleS]

nit: I'd make this optional so that configuration-less overrides can be done with just the strategy name.

[Linker44]

Good idea!

[Linker44]

since setting is as an Optional will make mypy implicitly interpret it as Dict[Any, Any] which is incompatible with our strategy configuration definition in fides that is Dict[str, Any] (it also wont accept Optional[]). i had to explicitly set it as Optional[Dict[str, Any]] and since pydantic BaseModel doesnt like Any types i had to type ignore. also setting is as Optional[] forces me to type ignore inside fides too because the strategy class states that configuration is not an optional field.

i guess this poses the question, Is it worth to do so?