simplifications

[t-bltg]

A few resolve simplifications:

1. do not parse an already parsed file (spurious Found dependencies: messages)
2. don't add an already added path in extra_path (less i/o ops with stat).

[codecov]

Codecov Report

Merging #82 (dab8798) into main (5dbe1b6) will increase coverage by 0.02%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
+ Coverage   92.78%   92.80%   +0.02%     
==========================================
  Files           7        7              
  Lines         859      862       +3     
==========================================
+ Hits          797      800       +3     
  Misses         62       62              

Impacted Files	Coverage Δ
src/resolve.jl	93.85% <66.66%> (+0.04%)	⬆️

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[cjdoris]

Looks good, thank you.

I'm curious, in what situation are you getting those repeats?

[t-bltg]

I was investigating an irritating thing (bug ?), where creating a directory in a local project folder would fail _resolve_can_skip_1 and thus making the cached STATE unresolved.

EDIT: split into dedicated issue: #83.

This PR doesn't fix #83, but still worth it I guess.