Add a public Observable alias to overcome Xcode 15 bug

[TR0NZ0D]

Xcode 15 beta 6+ is failing builds, reported in swiftlang/swift#67815.

@freak4pc's Fix (RxSwiftCommunity/RxSwiftExt@494fe20) in RxSwiftExt repo for this issue also resolves this problem, which was reported in RxSwiftCommunity/RxSwiftExt#272

#trivial

[ThePragmaticArt]

Isn't this just a side effect of Swift having a proper Observable type in iOS 17 to support SwiftUI? Namespacing seems to appropriately resolve this, but a collision is inevitable and adding a type alias at a library level for the same collision probably isn't the best approach here.

[JoeMatt]

closing for #202.

Agreed with above, that a global typealias is kicking the issue to other code.