Consider adding support for Appearance Tools and Custom Spacing in the Block Editor

[chrisblakley]

These provide additional features to the native block editor:

add_theme_support( 'appearance-tools' );
add_theme_support( 'custom-spacing' );

Consider adding this for everyone, or would it be beneficial to add for developers only? If doing it behind a conditional, think of what issues may arise if a developer creates a post using these but then a content manager needs to make edits...