Add: Typography styling support to the navigation submenu block.

[jorgefilipecosta]

Fixes: #49319

Currently, the navigation submenu block does not support typography styles, while the navigation link block supports them.
This has several issues:

1. The user is not able to configure the typography of submenu links as they can on normal links.
2. When a normal link is converted to a submenu its styles are lost which is a buggy behavior.

This PR adds the same typography styles supported in the navigation link to the navigation submenu block.

cc: @cuemarie, @annezazu

Testing Instructions

I added a navigation submenu and verified I could change its typography. The styles are applied on both the frontend and the editor.

I added a navigation link with some typography styles. I transformed that link into a submenu and verified the styles were kept (on the trunk they are discarded).

[github-actions]

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Co-authored-by: jorgefilipecosta <jorgefilipecosta@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
Co-authored-by: annezazu <annezazu@git.wordpress.org>
Co-authored-by: cuemarie <plari@git.wordpress.org>

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[annezazu]

Thanks so much for the quick work here! Tested this and can confirm it works (keep styling of parent menu and applies it to submenu):

style.menu.and.submenu.mov

[Mamaduka]

This looks good and matches similar settings for other blocks.