Previously ng-dev loaded the config through a javascript file, this
change allows for the loaded file to be either javascript or
typescript. This enables configurations to be written with type
safety.
PR Close#37017
Migrating to a js file for providing a configuration allows for more
extensive configuration at run time. This allows for configs to include
logic and move beyond static values found in JSON files.
PR Close#36918
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
