Is your feature request related to a problem? Please describe.

We often use textwrap.dedent to format multiline descriptions in our pydantic models, e.g.:

class MyModel(BaseModel):
    something: int = Field(
        descripion = dedent(
            """
            Here is the description.
            """
        ),
    )

This allows us to have nicely formatted descriptions in our source but strip out the leading whitespace
from the multi-line string literal. This is a fairly common convention for pydantic models with complex
description fields.

However, it appears that griffe[-pydantic] does not handle this construct and as a result such fields
end up having no description shown in the generated docs.

Describe the solution you'd like

I would like griffe-pydantic to implicitly handle this and treat dedent() as a standard string literal transformation.

Describe alternatives you've considered

The only workaround I can think of currently is to duplicate the description in a doc-string. This appears
to work but has obvious issues with maintenance:

class MyModel(BaseModel):
    something: int = Field(
        descripion = dedent(
            """
            Here is the description.
            Second line.
            """
        ),
    )
    """
    Here is the description.
    Second line.
    """

Additional context