Named shared environments

[cjdoris]

Fixes #64.

[codecov]

Codecov Report

Merging #72 (34b2dbd) into main (8fb0d70) will decrease coverage by 1.00%.
The diff coverage is 16.66%.

❗ Current head 34b2dbd differs from pull request most recent head 1f96f07. Consider uploading reports for the commit 1f96f07 to get more accurate results

@@            Coverage Diff             @@
##             main      #72      +/-   ##
==========================================
- Coverage   92.37%   91.37%   -1.00%     
==========================================
  Files           7        7              
  Lines         852      858       +6     
==========================================
- Hits          787      784       -3     
- Misses         65       74       +9     

Impacted Files	Coverage Δ
src/resolve.jl	90.90% <16.66%> (-2.03%)	⬇️
src/env.jl	96.42% <0.00%> (-1.79%)	⬇️

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