feat(admin-sdk,admin-bundler,admin-shared,medusa): Restructure admin packages (#8988)

**What**
- Renames /admin-next -> /admin
- Renames @medusajs/admin-sdk -> @medusajs/admin-bundler
- Creates a new package called @medusajs/admin-sdk that will hold all tooling relevant to creating admin extensions. This is currently `defineRouteConfig` and `defineWidgetConfig`, but will eventually also export methods for adding custom fields, register translation, etc. 
  - cc: @shahednasser we should update the examples in the docs so these functions are imported from `@medusajs/admin-sdk`. People will also need to install the package in their project, as it's no longer a transient dependency.
  - cc: @olivermrbl we might want to publish a changelog when this is merged, as it is a breaking change, and will require people to import the `defineXConfig` from the new package instead of `@medusajs/admin-shared`.
- Updates CODEOWNERS so /admin packages does not require a review from the UI team.

packages/admin/dashboard/scripts/generate-currencies.js

@@ -0,0 +1,46 @@
+async function generateCurrencies() {
+  const { currencies } = await import(
+    "@medusajs/medusa/dist/utils/currencies.js"
+  )
+  const fs = await import("fs")
+  const path = await import("path")
+
+  const record = Object.entries(currencies).reduce((acc, [key, values]) => {
+    const code = values.code
+    const symbol_native = values.symbol_native
+    const name = values.name
+    const decimal_digits = values.decimal_digits
+
+    acc[key] = {
+      code,
+      name,
+      symbol_native,
+      decimal_digits,
+    }
+
+    return acc
+  }, {})
+
+  const json = JSON.stringify(record, null, 2)
+
+  const dest = path.join(__dirname, "../src/lib/currencies.ts")
+  const destDir = path.dirname(dest)
+
+  const fileContent = `/** This file is auto-generated. Do not modify it manually. */\ntype CurrencyInfo = { code: string; name: string; symbol_native: string; decimal_digits: number }\n\nexport const currencies: Record<string, CurrencyInfo> = ${json}`
+
+  if (!fs.existsSync(destDir)) {
+    fs.mkdirSync(destDir, { recursive: true })
+  }
+
+  fs.writeFileSync(dest, fileContent)
+}
+
+;(async () => {
+  console.log("Generating currency info")
+  try {
+    await generateCurrencies()
+    console.log("Currency info generated")
+  } catch (e) {
+    console.error(e)
+  }
+})()

packages/admin/dashboard/scripts/generate-types.js

@@ -0,0 +1,38 @@
+/**
+ * We can't use the `tsc` command to generate types for the project because it
+ * will generate types for each file in the project, which isn't needed. We only
+ * need a single file that exports the App component.
+ */
+async function generateTypes() {
+  const fs = require("fs")
+  const path = require("path")
+
+  const distDir = path.resolve(__dirname, "../dist")
+  const filePath = path.join(distDir, "index.d.ts")
+
+  const fileContent = `
+import * as react_jsx_runtime from "react/jsx-runtime"
+
+declare const App: () => react_jsx_runtime.JSX.Element
+
+export default App
+`
+
+  // Ensure the dist directory exists
+  if (!fs.existsSync(distDir)) {
+    fs.mkdirSync(distDir)
+  }
+
+  // Write the content to the index.d.ts file
+  fs.writeFileSync(filePath, fileContent.trim(), "utf8")
+
+  console.log(`File created at ${filePath}`)
+}
+
+;(async () => {
+  try {
+    await generateTypes()
+  } catch (e) {
+    console.error(e)
+  }
+})()