Interactivity API: Support setting a namespace using a string in data-wp-interactive

[luisherranz]

What?

Support setting a namespace using a string in data-wp-interactive, like data-wp-intearctive="myPlugin".

Why?

Because the namespace is the main and only property supported now, so it makes sense to allow it, instead of the longer data-wp-interactive='{ "namespace": "myPlugin" }' form.

How?

By checking if the attribute value of data-wp-intearctive is a string, and if it is, using it as the namespace.

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In the server, string namespaces are supported in this WP Core PR:

• Interactivity API: Server Directive Processing wordpress-develop#5953
• WordPress/wordpress-develop@6345e24

Be aware that here in Gutenberg this will be supported once the PR is committed to WP Core and the code is synced back to Gutenberg.

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Co-authored with @sirreal.

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Props luisherranz, darerodz.

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Co-authored-by: luisherranz <luisherranz@git.wordpress.org>
Co-authored-by: DAreRodz <darerodz@git.wordpress.org>

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[luisherranz]

I've added again the namespace restrictions because as @DAreRodz pointed out, things that contain :: could fail, like { "text": "Hi :: there!" } or "Hi :: there!".

I'll apply the same restrictions in the server directive processing.

[DAreRodz]

LGTM!

PS: I guess have to update the namespaces from objects to strings in core blocks, right? We can do so in a different PR, don't worry. 😄

[luisherranz]

It's not strictly required because both are supported, but yeah, it'd be nice.