[SPARK-50669][SQL] Change the signature of TimestampAdd expression

[stevomitric]

What changes were proposed in this pull request?

In this PR the signature of TimestampAdd function was changed from IntegerType to LongType for quantity parameter.

Why are the changes needed?

To allow long types to be passed to timestamp_add function. Currently passing anything larger then Int32.MaxValue will cause a cast overflow exception. There is no need to restrict this method to only in32 values.

Does this PR introduce any user-facing change?

Yes, the following query passes:

select
  timestampadd(
    millisecond,
    1733011227403,
    timestamp '1970-01-01T00:00:00.000Z'
  )

Above query now returns 2024-12-01T00:00:27.000+00:00 instead of throwing a cast exception.

How was this patch tested?

New tests in this PR.

Was this patch authored or co-authored using generative AI tooling?

No

[cloud-fan]

Some tests need to be updated.

[stevomitric]

Some tests need to be updated.

Updated golden files & scalastyle.