Emit named functions in DEV mode for easier profiling

[gampleman]

Quick Summary: (anonymous) functions are hard to work with in the browsers Dev tools when profiling code. Having something like user$module$function would be much easier to understand.

Elm functions are currently defined something like this in JS:

var user$project$module$function = F2(function(arg1, arg2) {
   ...
});

However, the F2 call means that the JS engine doesn't infer that the name of the function is actually user$project$module$function, but considers it (anonymous). However, if we had the following output:

var user$project$module$function = F2(function user$project$module$function(arg1, arg2) {
   ...
});

then the dev tools could print much nicer stack frames.

[github-actions]

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