Improve temporal type handling

[big-andy-coates]

part of: https://github.com/creek-service/creek-kafka/issues/463

• Instant now serialized as string, inline with Jackson, with date-time format
• LocalTime no longer marked as time format, as serialized form is missing offset.
• OffsetTime now supported: string with time format
• OffsetDateTime now supported: string with date-time format
• MonthDay now supported: string
• YearMonth now supported: string
• Year now supported: string
• Duration now supported: number, inline with Jackson
• Period now supported: string with duration format, inline with Jackson

The changes to how Instant and LocalTime are handled are breaking changes, but as they were incompatible with Jackson, this is seen more as a bugfix.

[coveralls]

coverage: 93.704% (+0.2%) from 93.511% when pulling 7f184b26b92d627a04db6a35957a5a0daa0577e7 on temporal-types into e434ddb405a28ee530f6a72524978f93a687e301 on main.