RFR: 8307208: Add GridPane constructor that accepts hGap and vGap values

[Andy Goryachev]

On Wed, 3 May 2023 20:57:53 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

>> There is a script that does this automatically.
>
> I will change them in my next commit. Completely forgot about them. :)

I thought it's only in jdk, not jfx.  @kevinrushforth could you confirm that?

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PR Review Comment: https://git.openjdk.org/jfx/pull/1125#discussion_r1184280648