Docs: Add section in block RFC about register_block_type_from_metadata

[gziolo]

Description

Follow-up for #20794.

Related comment #20794 (comment):

My first idea was to omit the documentation part until we reach WordPress 5.5 release cycle to avoid all the confusion for those who browse https://developer.wordpress.org/block-editor/ and can't use this new block registration utility with WordPress core. We also miss support for two features proposed in Block Registration RFC:

• assets integration
• internatiolization

I think it might be a good idea to add a section in this RFC document as a follow-up (plus refresh the document in general) that would describe how this is going to work moving forward. If you agree I'm happy to open a follow-up PR.

This PR documents new PHP API proposed: register_block_type_from_metadata.

[github-actions]

Size Change: 0 B

Total Size: 904 kB

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[aduth]

Is it still expected that this document continue to be maintained, if the RFC experiment was otherwise discontinued?

[gziolo]

I would be in favor of keeping it for a few more weeks and convert it into final document next to other Block API documentation pages.