builtin mappers for Instant's

[ErwinOlie]

Is your feature request related to a problem? Please describe.
there are no builtin mappers between java/kotlin/kotlinx mappers yet

Describe the solution you'd like
builtin mappers for
kotlinx.datetime.Instant --> java.time.Instant
java.time.Instant --> kotlinx.datetime.Instant
kotlinx.datetime.Instant--> kotlin.time.Instant
java.time.Instant --> kotlin.time.Instant

note that mapping from kotlin.time.Instant would not be safe, since it can be either epoch-based (safe) or monotonic based (unsafe)

[stefankoppier]

Hi @ErwinOlie. Missing mappers for kotlinx instant to java instant was intententional, see https://github.com/Kotlin/kotlinx-datetime?tab=readme-ov-file#deprecation-of-instant.

java.time.Instant to kotlin.time.Instant would be an useful addition in the :mappie-api built-in jvm mappers.