Decimal arithmetic computation fails to run because decimal type equality

[viirya]

Describe the bug

The functions like unary_dyn fails to compute if it finds inequality between array type and operation operand type:

For decimal types, just precision/scale can also fail the type equality. Because decimal types have default precision and scale, such check makes no sense for decimal types:

NotYetImplemented("Cannot perform unary operation of type Decimal128(38, 10) on array of type Decim
al128(38, 2)")'

This makes scalar arithmetic kernels cannot work on decimal types mostly.

To Reproduce

Expected behavior

Additional context

[alamb]

label_issue.py automatically added labels {'arrow'} from #3345