Describe the current behavior

Prefect's settings.py is roughly ~150 custom Setting objects which is dynamically collected into a BaseSettings object at runtime. By dynamically collecting these at runtime, this

• obfuscates typing and
• makes it difficult to ergonomically inherit from in derivative frameworks (like ControlFlow).

For instance, it's difficult to change the default value of a single setting given it's current design, but could be trivial if PrefectBaseSetting was a simple static subclass of Pydantic's BaseSetting.

From examining it's original PRs, the current design was taken on:

• to attach validators to fields themselves, and not as field_validators on the Settings object.
• to create settings dependent on the value of other settings.

These two outcomes required a sophisticated design two years ago, but are now first-class concepts in Pydantic: AfterValidator and computed_field, respectively.

Describe the proposed behavior

I propose having Prefect's BaseSetting's object be a canonical subclass of Pydantic's BaseSetting:

class PrefectBaseSetting(pydantic_settings.BaseSetting)
    PREFECT_WHATEVER_1 = Field(...)
    ...
    PREFECT_WHATEVER_150 = Field(...)

Example Use

No response

Additional context

No response