shrink visibility of types/functions

[yuankunzhang]

No description provided.

[tertsdiepraam]

I'll look at this in-depth later but note that this is mostly unnecessary because the modules these items are in are not public. I'm not really concerned with limiting visibility beyond the crate level in this crate. That mostly adds noise for a crate this small.

The same goes for the qualifiers on the fields. If a type is pub(crate) then pub on a field means the same thing as pub.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (cc7c143) to head (c443685).

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #144   +/-   ##
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