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/FeatureFlagNotice/index.tsx

@@ -1,9 +1,9 @@
 import React from "react"
-import { Badge, Link, Tooltip } from "@/components"
+import { Badge, LegacyLink, Tooltip } from "@/components"
 
 export type FeatureFlagNoticeProps = {
   featureFlag: string
-  type?: "endpoint" | "parameter"
+  type?: "endpoint" | "type"
   tooltipTextClassName?: string
   badgeClassName?: string
   badgeContent?: React.ReactNode
@@ -22,12 +22,13 @@ export const FeatureFlagNotice = ({
         <span className={tooltipTextClassName}>
           To use this {type}, make sure to
           <br />
-          <Link
+          {/* TODO replace with Link once we move away from Docusaurus */}
+          <LegacyLink
             href="https://docs.medusajs.com/development/feature-flags/toggle"
             target="__blank"
           >
             enable its feature flag: <code>{featureFlag}</code>
-          </Link>
+          </LegacyLink>
         </span>
       }
       clickable