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/ExpandableNotice/index.tsx

@@ -1,5 +1,5 @@
 import React from "react"
-import { Badge, Link, Tooltip } from "@/components"
+import { Badge, LegacyLink, Tooltip } from "@/components"
 
 export type ExpandableNoticeProps = {
   type: "request" | "method"
@@ -20,8 +20,11 @@ export const ExpandableNotice = ({
         <>
           If this {type} accepts an <code>expand</code>{" "}
           {type === "request" ? "parameter" : "property or option"},
-          <br /> this field can be <Link href={link}>expanded</Link> into an
-          object.
+          {/* TODO replace with Link once we move away from Docusaurus */}
+          <br /> this field can be <LegacyLink href={link}>
+            expanded
+          </LegacyLink>{" "}
+          into an object.
         </>
       }
       clickable