Export <ThemeScript> (#355)

* Add opt-out of script insertion from provider, various type updates, avoid `disableAnimation` if not needed

* reduce formatting diffs

* reduce more formatting diffs

* handle multiple attributes in `isThemeCurrentTheme`

* export <ThemeScript />

* Update types.ts

* Update index.tsx

Co-authored-by: Steven <steven@ceriously.com>

* reduce diff; make script id optional

* reduce the diff

* revert more changes

* more diff reduction

* reduce the diff again

* pass optional ID from parent

* remove unnecessary id

* add tests of `withScript=false` and manual `<ThemeScript>` insertion

* formatting

* more formatting tweaks

* remove useless test

* remove more attributes before each test

* move `withScript` test

* remove stuff from previous PR

* remove test from previous PR

* remove more stuff from previous PR

* add line break

* remove whitespace

---------

Co-authored-by: Steven <steven@ceriously.com>

Author: plmrry

next-themes/src/index.tsx

@@ -184,7 +184,7 @@ const Theme = ({
   )
 }
 
-const ThemeScript = React.memo(
+export const ThemeScript = React.memo(
   ({
     forcedTheme,
     storageKey,