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/medusa-config.js

@@ -123,5 +123,10 @@ module.exports = {
       resources: "shared",
       resolve: "@medusajs/store",
     },
+    [Modules.TAX]: {
+      scope: "internal",
+      resources: "shared",
+      resolve: "@medusajs/tax",
+    },
   },
 }