Support suspend in fx

[nomisRev]

Currently we don't support suspend for fx blocks.

This prevents mixing suspend with fx, which would be the most Kotlin idiomatic.

import arrow.core.Either
import arrow.core.extensions.fx

data class User(val name: String)
object DomainError

suspend fun fetchDataFromNetwork(id: Int): Either<DomainError, User> = TODO()

suspend fun getUser(id: Int) : Either<DomainError, User> =
  Either.fx<DomainError, User> {
    // Restricted suspending functions can only invoke member or extension suspending functions on their restricted coroutine scope
    !fetchDataFromNetwork(id) 
  }

In #112, this change was implemented for Either, and it can be implemented for all other data types in the same way.

This needs to happen for all data types that are not marked for deprecation in #114.

• Either
• Validated
• NonEmptyList
• Eval
• Const
• Ior

[aballano]

All of NonEmptyList, ListK, SequenceK and Ior would need a rework on the current system to use flatmap (or something similar) as otherwise we cannot achieve the same operation with the current architecture.

[aballano]

Leftover datatypes will be tackled in #171