Adds screen to list usable channels

[ConorOkus]

This adds a screen to list all the usable channels and the available balance.

The logic for the balance/progress bar is not quite right (will update)

[thunderbiscuit]

Looks good to me, I just had some small comments/nits. Also think it might need a rebase to pick up the latest 9be0033 commit.

[thunderbiscuit]

Yep that's the better way to do it for sure.

[thunderbiscuit]

I think you might be able to do without the create() method in the interface, and simply create an AccessImpl object directly at the call-site.

For example if you remove the companion object entirely, the one call to the AccessImpl is in WalletScreen and would become

onClick = {
    CoroutineScope(Dispatchers.IO).launch {
        // Access.create().sync()
        AccessImpl().sync()
    }
}

[thunderbiscuit]

Or you could create the object above and simply reuse it every time you sync instead of creating a new one every time.

@Composable
fun WalletScreen() {
    val accessImpl = AccessImpl()
// ...
onClick = {
    CoroutineScope(Dispatchers.IO).launch {
        accessImpl.sync()
    }
}

[ConorOkus]

Updated in c446025

[thunderbiscuit]

Small nit, but by convention when an object is extending an interface or another class the colon is separated by a space (ListChannelsScreen : Screen) as opposed to when it's used to declare a variable type or function return type (val age: Int)

[ConorOkus]

Updated in 3ad40d6