Add support for SwiftUI withTransaction API

[drucelweisse]

This adds EffectPublisher support to perform block with SwiftUI Transaction. As all animation stuff happens using Transaction, and Animation is a concrete example of Transaction it seems reasonable to support that, even if it has few use cases.

Changes: Instead of creating another function, I generalized it for transactions and in .animation(_ animation: Animation? = .default) function calls it under the hood.

Example from SwiftUI Q&A Sessions

Is there way to show .fullScreenCover without animation? I don't want to user see animated cover show from bottom to top. because it still see underline view in a short time.

You can create a Transaction value, set its disablesAnimations property to true, then set the binding that presents the fullScreenCover inside a withTransaction block. Something like:

var t = Transaction()
t.disablesAnimations = true
withTransaction(t) {
    isCoverPresented = true
}

[mbrandonw]

Hey @drucelweisse, thanks for the PR!

Overall we think this is a pretty good change. We need a little more time to be able to fully look over the code, but one thing that popped out to us was that maybe even Effect's Send type should take a transaction so that you can do things like:

Effect.run { send in 
  await send(.response, transaction: disableAnimations)
}

Further, even ViewStore.send could take a transaction too. Want to experiment with adding those too and we'll come back to this soon?

[drucelweisse]

Hi @mbrandonw! I've definitely missed out that Send also has an Animation overload. Will add that into pr.