Add support for wireguard predown hook

[xeptore]

• increase portability of mock code generation make target
• add unavailable/invalid wg device test case
• add go-report-card badge to readme
• add wg interface dump parser
• fix wg peer download/upload bytes mapping
• run build ci workflow for pull request

Closes #9.

[codecov]

Codecov Report

Patch coverage: 85.61% and project coverage change: -6.08 ⚠️

Comparison is base (8c451e0) 93.87% compared to head (d0f66ab) 87.80%.

❗ Current head d0f66ab differs from pull request most recent head a56adf9. Consider uploading reports for the commit a56adf9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
- Coverage   93.87%   87.80%   -6.08%     
==========================================
  Files           2        3       +1     
  Lines          49      164     +115     
==========================================
+ Hits           46      144      +98     
- Misses          2       20      +18     
+ Partials        1        0       -1     

Flag	Coverage Δ
unittests	87.80% <85.61%> (-6.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
ingest/ingest.go	70.58% <59.18%> (-22.44%)	⬇️
pkg/dump/parse.go	100.00% <100.00%> (ø)

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