Support for kotlinx-datetime

[mustafaozhan]

Hello 👋 It will be great to have support for kotlinx-datetime rather than ThreeTenABP. It will be also required in case you will be supporting Kotlin Multiplatform later on!

[cortinico]

Indeed, I've created the kmp label so we can track all the things needed to offer a -kmp flavor of the template

[mustafaozhan]

@cortinico Another reason now ThreeTenABp has this in their readme.

Attention: Development on this library is winding down. Please consider switching to Android Gradle plugin 4.0, java.time.*, and its core library desugaring feature in the coming months.

[cortinico]

Yup we should definitely look into this 👍 cc @macisamuele