RFR: JDK-8304439: Subscription based listeners [v13]

[Michael Strauß]

On Thu, 13 Jul 2023 00:01:23 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

>> Makes `Subscription` public (removing some of its methods that are unnecessary), and adds methods that can provide `Subscription`s in `ObservableValue`.
>
> John Hendrikx has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix ObservableSubscriptionsTest

Marked as reviewed by mstrauss (Committer).

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PR Review: https://git.openjdk.org/jfx/pull/1069#pullrequestreview-1527401282