RNMobile: Add new Video block capability

[SiobhyB]

What?

This PR is adding a new capability to enable changes to the Video block.

Why?

There are times where the Video block doesn't work as expected, this PR helps lay the groundwork for addressing this.

How?

Previously-used patterns to add a new capability have been followed.

Testing Instructions

See the related Gutenberg Mobile PR here for an example of when this new capability will be useful: wordpress-mobile/gutenberg-mobile#6634

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Co-authored-by: SiobhyB <siobhyb@git.wordpress.org>
Co-authored-by: derekblank <derekblank@git.wordpress.org>
Co-authored-by: fluiddot <carlosgprim@git.wordpress.org>

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[derekblank]

LGTM -- Approving, if it's advantageous to merge the enableVideoPressV5Support flag ahead of the ongoing changes in Automattic/jetpack#35637. 🚀

[fluiddot]

LGTM -- Approving, if it's advantageous to merge the enableVideoPressV5Support flag ahead of the ongoing changes in Automattic/jetpack#35637. 🚀

I'm hesitant to proceed with merging these changes before WP-Android and WP-iOS PRs are ready to be merged. Otherwise, we'll likely get build failures when using trunk branches across repositories.

[fluiddot]

LGTM 🎊 !