chore: move next admin packages to core repo (#5983)

**What**
- Move packages for `next` version of admin to core repo

**Other**
- Since this PR introduces packages that depend on Vite 5, it also introduces @types/node@^20. We have never had a direct dependency on the types package for Node, and as far as I can see that has resulted in us using the types from Node.js@8, as those are a dependency of one of our dependencies. With the introduction of @types/node@^20, two of our packages had TS errors because they were using the NodeJS.Timer type, which was deprecated in Node.js@14. We should add specific @types/node packages to all our packages, but I haven't done so in this PR to keep it as clean as possible.
- Q: @olivermrbl I've added the new packages to the ignore list for changeset, is this enough to prevent them from being published?

packages/admin-next/admin-bundler/src/cli/create-cli.ts

@@ -0,0 +1,28 @@
+import { Command } from "commander"
+
+import { build } from "../api/build"
+import { bundle } from "../api/bundle"
+import { dev } from "../api/dev"
+
+export async function createCli() {
+  const program = new Command()
+
+  program.name("medusa-admin")
+
+  program
+    .command("dev")
+    .description("Starts the development server")
+    .action(dev)
+
+  program
+    .command("build")
+    .description("Builds the admin dashboard")
+    .action(build)
+
+  program
+    .command("bundle")
+    .description("Bundles the admin dashboard")
+    .action(bundle)
+
+  return program
+}