Clean up root of /src directory

[reefdog]

We have a handful of files at the root of /src that should probably be organized to sub-directories. E.g., map-proposals.ts (and its testfile) should go in /src/utils.

Let's do a pass over that on a rainy day.

[slifty]

@reefdog just for some context there was a local MO to avoid a generic /utils directory, with the idea being that it becomes an antipattern / a disorganized cluster of otherwise unrelated functionality, and it would be better to try to keep things in well-named groups, either as root level files OR (as things expand) in folders.

This is why in /service we don't have a utils directory but we DO have a series of named folders and a few root level code files (e.g. logger is a root level concept).

I'm not actually trying to strongly advocate against a utils though the merits of the idea seemed strong enough to at least give it a whirl at the time!

[reefdog]

@slifty That's a good note. I do think something as specific as map-propposals.ts doesn't need to be at src/, but am definitely open to a finer organization than just utils/

[slifty]

Let's take this on (or mark it as complete if it's already taken on!)

Putting it in the Phase 3 project.