Block Bindings: Bootstrap sources with inline script from server

[santosguillamot]

Bootstrap block bindings sources earlier in the process through an inline script to ensure they are available when developers want to extend them in the client. Following the same pattern other APIs like registering block types are doing.

Fix the issue reported here: WordPress/gutenberg#66031.

Fixes the issue reported here: ​https://github.com/WordPress/gutenberg/issues/66031

Basically, we need to ensure the bootstrap happens early in the process to ensure extenders code runs after it. The current implementation runs after domReady which seems to be too late.

In this pull request, I propose changing the approach and using an inline script like we are doing for bootstrapping block types.

Trac ticket: https://core.trac.wordpress.org/ticket/62225

Still needs the track ticket to be complete.

I have just created the ticket: https://core.trac.wordpress.org/ticket/62225#ticket

[gziolo]

In [59238]:

Editor: Bootstrap block binding sources with inline script from server

Bootstrap block bindings sources earlier in the process through an inline script to ensure they are available when developers want to extend them in the client. Following the same pattern other APIs like registering block types are doing.

Props santosguillamot, cbravobernal, gziolo.
Fixes #62225.

Committed with https://core.trac.wordpress.org/changeset/59238.