Support Metadata selection in PostTranslate Hook

[Xunzhuo]

my preference would be to have something like

resource:
  listener:
    selector: {}

which selects all listeners, these key values are based on resource metadata

or some form with a selector, so we can only send specific resources

• should the top level be resource or translationHook ?

Originally posted by @arkodg in #6524 (comment)