[macOS export] Add support for Xcode notarytool.

[bruvzg]

Adds support for new Xcode 13+ notarytool. In addition to the old altool (which is still supported until fall 2023 and usable for older Xcode versions).

Fixes godotengine/godot-proposals#5898

[akien-mga]

Not urgent but I noticed this warning for official builds too, so we'll have to update https://github.com/godotengine/godot-build-scripts/blob/main/build-release.sh#L53

As a side note, rcodesign moved to a new repo dedicated to Apple tools in Rust: https://github.com/indygreg/apple-platform-rs/tree/main/apple-codesign
But I don't think we refer to it by URL so this is just an FYI / relevant for our docs eventually.

[bruvzg]

Not urgent but I noticed this warning for official builds too, so we'll have to update https://github.com/godotengine/godot-build-scripts/blob/main/build-release.sh#L53

This can also be simplified a bit, notarytool have --wait argument, so won't need a loop.

As a side note, rcodesign moved to a new repo dedicated to Apple tools in Rust: https://github.com/indygreg/apple-platform-rs/tree/main/apple-codesign
But I don't think we refer to it by URL so this is just an FYI / relevant for our docs eventually.

Not in the engine code, but link in the docs should be updated (godotengine/godot-docs#6456).

[akien-mga]

Thanks!