docs: prep for v2 documentation (#6710)

This PR includes documentation that preps for v2 docs (but doesn't introduce new docs).

_Note: The number of file changes in the PR is due to find-and-replace within the `references` which is unavoidable. Let me know if I should move it to another PR._

## Changes

- Change Medusa version in base OAS used for v2.
- Fix to docblock generator related to not catching all path parameters.
- Added typedoc plugin that generates ER Diagrams, which will be used specifically for data model references in commerce modules.
- Changed OAS tool to output references in `www/apps/api-reference/specs-v2` directory when the `--v2` option is used.
- Added a version switcher to the API reference to switch between V1 and V2. This switcher is enabled by an environment variable, so it won't be visible/usable at the moment.
- Upgraded docusaurus to v3.0.1
- Added new Vale rules to ensure correct spelling of Medusa Admin and module names.
- Added new components to the `docs-ui` package that will be used in future documentation changes.

www/packages/docs-ui/src/components/EditButton/index.tsx

@@ -0,0 +1,16 @@
+import React from "react"
+import { Button } from "../.."
+
+type EditButtonProps = {
+  filePath: string
+}
+
+export const EditButton = ({ filePath }: EditButtonProps) => {
+  return (
+    <Button variant="secondary" className="mb-docs_1">
+      <a href={`https://github.com/medusajs/medusa/edit/develop${filePath}`}>
+        Edit this page
+      </a>
+    </Button>
+  )
+}