Parser not invoked when `coerce = True`

[JungeWerther]

Describe the bug
A clear and concise description of what the bug is.

• [ x] I have checked that this issue has not already been reported.
• [ x] I have confirmed this bug exists on the latest version of pandera.
• (optional) I have confirmed this bug exists on the main branch of pandera.

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Code Sample, a copy-pastable example

class A(pa.pandas.DataFrameModel):
     c: float = pa.pandas.Field(alias="B", coerce=True) 
     @pa.pandas.parser("B")
     my_parser(cls, series: pd.Series) -> Series:
          assert False
          return series

Expected behavior

Above code never invokes my_parser since coerce=True. However the parser can perform effects or manipulations that are independent of the typecast presumed by coerce=True. If coercion is a special case of parsing, then I would expect the parser to take precedence of the coerce flag, instead of the other way around.