[wp compliance] new strategy for inline printing of scripts and stylesheets

[ghost]

Some scripts and stylesheets of the plugin needs to be printed inline and are not added to an alread registered script.
Classic Editor plugin does it for example here : classic-editor.php#L416
Another popular plugin, Beaver Builder does it too for example here : https://plugins.trac.wordpress.org/browser/beaver-builder-lite-version/trunk/classes/class-fl-builder.php#L763

For scripts that need to be printed inline and not added to an already registered script, it iscompliant to use wp_print_inline_script_tag() as described here : https://developer.wordpress.org/reference/functions/wp_add_inline_script/#comment-5304 => Important : this can't be done in footer hooks. It would be too late