[6.x] Code-split tiptap, codemirror, prosemirror

[jasonvarga]

This introduces code splitting in a number of places.

Before this, the js file was 3,555.16 kB │ gzip: 995.28 kB.

I noticed tiptap, codemirror, prosemirror, etc are quite large and take up a big chunk of the JS. These are only ever used by specific fieldtypes like Bard, Code, Yaml, and Markdown.

This PR makes those fieldtypes into async components. Their JS will now only get loaded when they are used.

The Bard JS API needed to change too in order to support dynamic imports. The tiptap property has been removed and you will now get it passed into callbacks.

-const { Node, Mark, Extension } = Statamic.$bard.tiptap.core; 
 
-Statamic.$bard.addExtension(() => {
+Statamic.$bard.addExtension(({ tiptap }) => {
+   const { Node, Mark, Extension } = tiptap.core;
    return [
        Node.create({...}),
        Mark.create({...}),
        Extension.create({...}),
    ]
});

After these changes, the js file is 2,266.68 kB │ gzip: 607.05 kB.