feat(tax): migration file (#6523)

**What**
- Tax Module Migration file.
- Skeleton for API routes and integrations tests for tax API in v2

integration-tests/plugins/package.json

@@ -22,6 +22,7 @@
     "@medusajs/promotion": "workspace:^",
     "@medusajs/region": "workspace:^",
     "@medusajs/store": "workspace:^",
+    "@medusajs/tax": "workspace:^",
     "@medusajs/user": "workspace:^",
     "@medusajs/utils": "workspace:^",
     "@medusajs/workflow-engine-inmemory": "workspace:*",