Fix binary operator mapping in setup.py ast parser

[techalchemy]

• Fix handling of ast.binOp nodes during unmapping of setup.py files when parsing -- add mapping for all binary operators and execute translated functions using the unparsed left and right hand sides of the binary operator
• Add equivalent handling for ast.Compare types
• Add importlib.import_module attempts to ast.Compare evaluations when encountering ast.Attribute types on either side of the comparison
• Add handling for ast.IfExp type to evaluate truth values of the expression and return node.body if the expression is True, otherwise node.orelse
• Add equivalence mapping for ast.Ellipsis type which becomes ast.Constant in python >= 3.8
• Assorted additional optimizations around pip_shims invocations for tests to pass
• Handle AST comparisons which reference functions
• Add AST tests
• Fixes AST parsing of setup.py fails on non-addition type binOps #204
• Fixes Not all binary operators are mapped for translation when parsing setup.py #206
• Fixes AST parser for setup.py files doesn't map comparisons or BoolOps #207

[ghost]

DeepCode's analysis on #14292e found:

• ❌ 0 critical issues. ⚠️ 0 warnings and 8 minor issues. ✔️ 2 issues were fixed.

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[codecov]

Codecov Report

Merging #209 into master will decrease coverage by 1.12%.
The diff coverage is 55.35%.

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
- Coverage   63.21%   62.09%   -1.13%     
==========================================
  Files          13       13              
  Lines        5516     5345     -171     
  Branches     1339     1345       +6     
==========================================
- Hits         3487     3319     -168     
+ Misses       1578     1576       -2     
+ Partials      451      450       -1

Impacted Files	Coverage Δ
src/requirementslib/models/dependencies.py	57.04% <31.25%> (+0.1%)	⬆️
src/requirementslib/models/requirements.py	59.19% <33.33%> (-2.23%)	⬇️
src/requirementslib/models/markers.py	70.7% <59.45%> (+0.36%)	⬆️
src/requirementslib/models/setup_info.py	67.11% <66.23%> (-0.78%)	⬇️
src/requirementslib/models/utils.py	61.93% <80%> (+0.33%)	⬆️
src/requirementslib/models/lockfile.py	65.62% <0%> (-2.34%)	⬇️
src/requirementslib/models/pipfile.py	78.19% <0%> (-1.63%)	⬇️
src/requirementslib/models/vcs.py	70% <0%> (-1.43%)	⬇️
... and 7 more

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