F# 6.0 asynchronous enhancements.

[kekyo]

F# 6.0 is included with both Task-based computation expression and resumable infrastructure. It makes better performance and easy interoperable a lot of OSS based library/packages.

https://github.com/fsharp/fslang-design/blob/main/FSharp-6.0/FS-1087-resumable-code.md

Epoxy supports F#'s async computation expression directly. Today we need to switch resumable infrastructure.

Need to more research:

• It will makes breaking change for received Async<'T> methods/functions. Epoxy will expose replaced by Task<'T> or ResumableCode<'T> (?)
• Fit to ValueTask<'T> same as standard implementation (Epoxy.Wpf like) when vtask CE is ready.
• Or another approach.

[kekyo]

Since the vtask asynchronous workflow was introduced in F# 6.0, Epoxy's policy will be to match everything with ValueTask.