cli: add experimental backend start

Co-authored-by: blam <ben@blam.sh>
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/cli/package.json

@@ -36,6 +36,7 @@
     "@backstage/errors": "workspace:^",
     "@backstage/release-manifests": "workspace:^",
     "@backstage/types": "workspace:^",
+    "@esbuild-kit/cjs-loader": "^2.4.1",
     "@manypkg/get-packages": "^1.1.3",
     "@octokit/request": "^6.0.0",
     "@pmmmwh/react-refresh-webpack-plugin": "^0.5.7",
@@ -65,6 +66,7 @@
     "chalk": "^4.0.0",
     "chokidar": "^3.3.1",
     "commander": "^9.1.0",
+    "cross-spawn": "^7.0.3",
     "css-loader": "^6.5.1",
     "diff": "^5.0.0",
     "esbuild": "^0.17.0",
@@ -136,6 +138,7 @@
     "@backstage/dev-utils": "workspace:^",
     "@backstage/test-utils": "workspace:^",
     "@backstage/theme": "workspace:^",
+    "@types/cross-spawn": "^6.0.2",
     "@types/diff": "^5.0.0",
     "@types/express": "^4.17.6",
     "@types/fs-extra": "^9.0.1",