Using the Block Bindings editor API (JS) in WP 6.7

[justintadlock]

WordPress 6.7 exposes a partial set of JS-based editor functions for working with Block Bindings: WordPress/gutenberg#65713

• registerBlockBindingsSource: to register a source in the client.
• unregisterBlockBindingsSource: to unregister an existing source.
• getBlockBindingsSource: to get a specific registered source and its properties.
• getBlockBindingsSources: to get all the registered sources in the client.

These are now stable, public functions for theme and plugin authors to extend how Block Bindings work in their projects, especially custom Block Binding sources. I'm proposing a tutorial that walks developers through using these APIs to manipulate bindings in the editor.

There is an additional getFieldsList property that will also be public in the Gutenberg plugin only, which could also be a showcase of what's to come in the future.

[justintadlock]

The "create ticket from discussion" feature on GitHub seems to broken (at least for me) right now, so I just copied this over from: #316

[justintadlock]

I'm working on this one here: https://docs.google.com/document/d/17o20lmRBxbak8hegX-RmtpKjS2hKlyyc18mbaYR4IWs/edit?usp=sharing

Code examples are up with a rough idea of an outline. Now it's time to fill in all the blank space with words!