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ARROW-11551: [C++][Gandiva] Fix castTimestamp(utf8) function

* Parse the milliseconds portion of the input correctly. For example  for YY-MM-DD 00:00:00.1, number of milliseconds should be 100 instead of 1. It can also not be of more than 3 digits.
* Validate if the hour, minutes and seconds portion is out of range

Closes #9443 from projjal/casttimefix and squashes the following commits:

fcc6a559e <Projjal Chanda> fix casttimestamp function

Authored-by: Projjal Chanda <iam@pchanda.com>
Signed-off-by: Praveen <praveen@dremio.com>