feat! Port libvcs utilities

[tony]

Example of libvcs utilities backported to python 3.7 w/ strict mypy support

vcs-python/libvcs#415

[codecov]

Codecov Report

Merging #433 (d6ea5f1) into master (31b9428) will decrease coverage by 3.15%.
The diff coverage is 56.68%.

@@            Coverage Diff             @@
##           master     #433      +/-   ##
==========================================
- Coverage   86.34%   83.19%   -3.16%     
==========================================
  Files          22       26       +4     
  Lines        1824     2041     +217     
  Branches      277      329      +52     
==========================================
+ Hits         1575     1698     +123     
- Misses        170      252      +82     
- Partials       79       91      +12     

Impacted Files	Coverage Δ
src/libtmux/_internal/query_list.py	38.77% <38.77%> (ø)
src/libtmux/_internal/subprocess.py	92.98% <92.98%> (ø)
src/libtmux/_internal/dataclasses.py	100.00% <100.00%> (ø)
src/libtmux/_internal/types.py	100.00% <100.00%> (ø)

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