Implement Kotlinx immutable collections

[phucynwa]

Because Map<*> is a mutable type, it is unstable and badly affects compose performance, we should use Kotlin immutable collections' ImmutableMap instead.

Refer: https://betterprogramming.pub/optimizing-recomposition-in-jetpack-compose-stability-system-f8ec0c92de33

[sleeyax]

Is this ever gonna get merged?

[hichamboushaba]

Instead of adding an addition dependency here, why not just mark the Lyricist object as Immutable? IMO it should be enough, and would avoid adding an additional dependency (that's still in alpha) to the library.

[adrielcafe]

I agree that @Immutable should be enough and made this change on 1.5.0. If for any reason it don't fix the recomposition/performance issue we can try the immutable collection approach.

Thank you everyone!