Request: action decorator

[darlingm]

I like the @on decorator. I'd love to see an @action decorator so a:

Binding("x", "exit", "Exit")

Would be able to call:

@action("exit")
def exit_application(self) -> None:
    ...

Of course, note that the Binding action is "exit" which is given to the decorator, but the function name can be different.

I attempted to make this, reviewing some of the internal textual source code working with actions, but didn't get textualize to successfully call one of them.

Even if it's not something Textual wants to include, if anyone can make it I'd still be happy with that!

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