Remove validate_decimal_precision check in DecimalBuilder.append_value

[viirya]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

This is one issue found by enabling generate_decimal128_case integration case at C++ repo (apache/arrow#13219).

This crate validates precision of decimal by validate_decimal_precision in few places, e.g. DecimalBuilder's append_value. However, in decimal golden file 0.14.1_decimal.gold.json, there are some values failing this check. C++ doesn't perform similar check as I did a search (e.g. Decimal128Builder, DecimalFromString), and I can confirm that test case can be passed if I remove validate_decimal_precision check in append_value.

I'm wondering if we should remove the check to pass the test case? Or leaving generate_decimal128_case as skipped test case at the integration test?

Actually in C++, similar check is done when doing a full validating ArrayData: https://github.com/apache/arrow/blob/c715bebbd89089f385c9996560866da23ea1ddda/cpp/src/arrow/array/validate.cc#L672. We may move the check to validating ArrayData too.

Describe the solution you'd like

Remove validate_decimal_precision check in DecimalBuilder's append_value to pass the integration test case generate_decimal128_case.

Describe alternatives you've considered

Keep generate_decimal128_case as skipped test case

Additional context
Add any other context or screenshots about the feature request here.