Robert Anderson 74df751e48 Editor: Add Navigation Area infrastructure
Copies Navigation Area infrastrucutre from lib/navigation.php in Gutenberg. This
allows a Navigation block to be associated with a particular area which persists
when switching theme.

Props antonvlasenko, mamaduka, spacedmonkey.
See #54337.


git-svn-id: https://develop.svn.wordpress.org/trunk@52145 602fd350-edb4-49c9-b593-d223f7449a82
2021-11-12 03:53:18 +00:00
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