Parquet schema should allow scale == precision for decimal type

[sunchao]

Describe the bug

Currently when building a Parquet primitive type, the PrimitiveTypeBuilder won't allow cases such as Decimal(1, 1):

        if self.scale >= self.precision {
            return Err(general_err!(
            "Invalid DECIMAL: scale ({}) cannot be greater than or equal to precision \
             ({})",
            self.scale,
            self.precision
        ));

However this should be a valid case.

To Reproduce
Use PrimitiveTypeBuilder to construct a decimal type with the same scale and precision.

Expected behavior
The above case should be allowed.

Additional context
Add any other context about the problem here.