Cache global stylesheet by theme key #1666
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Ticket: https://core.trac.wordpress.org/ticket/53175
Props to @dd32
Global styles are used in a few different contexts (front, editor, customizer, the theme directory). In the last two contexts, it's important that switching themes immediately refreshes the global stylesheet, to avoid situations in which the styles of the previous theme load with the new one. This was brought up at WordPress/gutenberg#34531 (customizer) and at https://meta.trac.wordpress.org/ticket/5818 (theme directory).
This PR makes sure the stylesheet is regenerated upon switching themes.