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Thanks for taking an initial look @DanielMorales9. This PR is ready for another review

@robertwb @Abacn @shunping this could also use some eyes from Beam devs

Beam (FieldType.DATETIME) and Iceberg (timestamptz) handle timestamps with timezone in a similar way -- they resolve to UTC and drop the timezone information.

I added support for String timestamps to be parsed to OffsetDateTime. But I wonder if it makes sense to allow other types as well (LocalDateTime, joda DateTime, long) and resolve all these types to OffsetDateTime at UTC. This will allow us to have a more unified approach to timestamps - and Iceberg always resolves to UTC anyways so there's no harm in doing it from our side

Thanks for the LGTM -- will merge when tests pass