Mini queryset replacement

[tony]

We need a way to return a list of objects. Should be:

• Simplicity over performance
• Not meant for speed. ~100 objects.
• Iterable as a list through a for loop
• Iterable as a dictionary (pk, obj) via .items()
• Support direct lookups via a pk (e.g. git remote name)
• Support any (fixed) type of list item
• Type annotated

Nice to have:

• Should be comparable to other queryset objects

  Including inner data, if possible

• One file

• Simple

[codecov]

Codecov Report

Merging #330 (9a3ef73) into master (c97aa0d) will increase coverage by 0.79%.
The diff coverage is 84.74%.

❗ Current head 9a3ef73 differs from pull request most recent head c1649fe. Consider uploading reports for the commit c1649fe to get more accurate results

@@            Coverage Diff             @@
##           master     #330      +/-   ##
==========================================
+ Coverage   72.51%   73.31%   +0.79%     
==========================================
  Files          21       23       +2     
  Lines        1703     1821     +118     
==========================================
+ Hits         1235     1335     +100     
- Misses        468      486      +18     

Impacted Files	Coverage Δ
libvcs/utils/list_query.py	83.17% <83.17%> (ø)
tests/utils/test_list_query.py	100.00% <100.00%> (ø)

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[tony]

#334