Use Kotlin in supertokens-core

[yogurtearl]

Any interest in introducing Kotlin in supertokens-core ? As you probably know, you can add kotlin one file at a time, just start with moving a single .java -> .kt conversion.

The null-safety provided by Kotlin could be a great asset in a security focus identity platform.

Maybe start by using the Kotlin DSL for Gradle?

If you are even "Kotlin-curious", I can open a PR to show what it would take to introduce a bit of kotlin.

[rishabhpoddar]

hey @yogurtearl whilst null safety is a big positive, using kotlin for the core is not a priority for us at the moment.

That being said, im keeping this issue open since we may want to transition in the future. Thanks