Move `MutableStateFlow.updateCopy` to arrow.optics

[Paradyx]

The extension function

public fun <T> MutableStateFlow<T>.updateCopy(block: Copy<T>.() -> Unit)

is useful outside of Android's compose library. I suggest to move it from arrow-optics-compose to the arrow-optics library for those who do not use compose.

[serras]

The problem here is the following: we don't want arrow-optics to depend on kotlinx-coroutines (where MutableStateFlow lives). We could create yet another arrow-optics-flows, but that seems overkill for just one function.

[Paradyx]

I understand the tradeoff. I will live with my little copy of this function then, instead of depending on compose in my project.
Thank you for the quick response.