feat(dev-infra): create common config file loading util (#36091)

Create a common config file loading utility function and the
necessary util directory.  This util directory can provide common
utility functions for usage inside of the dev-infra package.

PR Close #36091

package.json

@@ -148,6 +148,7 @@
     "@bazel/buildifier": "^0.29.0",
     "@bazel/ibazel": "^0.12.2",
     "@octokit/graphql": "^4.3.1",
+    "@types/json5": "^0.0.30",
     "@types/minimist": "^1.2.0",
     "@yarnpkg/lockfile": "^1.1.0",
     "browserstacktunnel-wrapper": "2.0.1",
@@ -169,6 +170,7 @@
     "gulp-tslint": "8.1.2",
     "husky": "^0.14.3",
     "jpm": "1.3.1",
+    "json5": "^2.1.2",
     "karma-browserstack-launcher": "^1.3.0",
     "karma-sauce-launcher": "^2.0.2",
     "madge": "^3.6.0",