feat: Add exclusion of modules during import time

[Czaki]

Based on my analysis of the project, the import of the module that is excluded is obsolete. And breaking import on such a module speeds up the run of the program and allows avoiding RecursionError.

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Note

Introduces pattern-based module exclusion in dependency discovery.

• Adds Excluder using glob patterns (compiled to regex) with caching to determine excluded module names
• MyModuleFinder now initializes an Excluder from excludes and aborts loads in load_module by raising ImportError for excluded modules
• Wires existing exclude list through py2dep to MyModuleFinder; minor formatting/whitespace tweaks in py2depgraph.py

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.86%. Comparing base (3234a8b) to head (020bd6c).

Files with missing lines	Patch %	Lines
pydeps/py2depgraph.py	88.88%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #242      +/-   ##
==========================================
+ Coverage   73.72%   73.86%   +0.14%     
==========================================
  Files          19       19              
  Lines        1926     1944      +18     
  Branches      359      363       +4     
==========================================
+ Hits         1420     1436      +16     
- Misses        399      400       +1     
- Partials      107      108       +1     

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[thebjorn]

Can you write a testcase that hits the excluded cache (https://app.codecov.io/gh/thebjorn/pydeps/pull/242?src=pr&el=tree#9bb30ac481a77ac543d7347a8122083e-R91)?