RFR: 8332895: Support interpolation for backgrounds and borders [v3]

[Michael Strauß]

On Sun, 4 Aug 2024 22:55:22 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

>> I don't quite like returning any particular value from `convertBack` as a signal for "this style converter doesn't support deconstruction", so I've made it more explicit with the marker interface `StyleConverter.SupportsDeconstruction`. This removes the marker interface `ComponentTransitionable` entirely.
>
> Thanks, I think having this with the StyleConverter makes more sense.

I've replaced the marker interface with an annotation, since it seems to be more of a meta-statement about the type.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1522#discussion_r1706220057