Using the helper `definitionsFromContext` generate quite long name for
stimulus controller in component, ie :
`tag-list-input-component--tag-list-input`.
This custom loader will generate much more readable name, ie L
`tag-list-input`. It's expecting the following pattern :
ofn_component/ofn_controller.js and will fall back to the default
of replacing "_" by "- and "/" by "--" for controller not matching
the pattern.