`pa.Column` mypy typing should accept `pl.Decimal`

[gregtesseract]

Describe the bug
As title.

• I have checked that this issue has not already been reported.
• 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

import pandera.polars as pa
import polars as pl

pa.Column(pl.Decimal(precision=38, scale=6))

Expected behavior

Mypy to pass, but instead, gives:

Argument 1 to "Column" has incompatible type "Decimal"; expected "str | type | DataTypeClass | None"Mypy[arg-type]

Desktop (please complete the following information):

N/A

[gregtesseract]

Also happens with pl.Struct