Replace anonymous default export with named exported

[EvitanRelta]

Typescript keeps warning about anonymous default exports.

Anonymous default exports also has problems with being unable to declare the export type (microsoft/TypeScript#13626).

And Typescript might not be able to infer the export type too:

---

Thus, we should replace them with named export. From this:

import Code from '@tiptap/extension-code'

export default Code.extend({ excludes: '' })

To this:

import Code from '@tiptap/extension-code'

export const CodeNoExcludes = Code.extend({ excludes: '' })