Enforce clang-format for C source files

[rafaelroquetto]

• Do a clang-format pass on existing C source files to bring them to a baseline
• Provide a git pre-commit hook that automatically runs clang-format on staged C/C++ files
• Provide a github workflow to enforce modified C files are up to standard
• Regenerate eBPF binaries to ensure tests passes and that they are matching the new baseline

This PR is better reviewed on a per commit basis

Hint: use git diff|blame -w to ignore whitespace when comparing across revisions.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.20%. Comparing base (3fc48aa) to head (168e8b4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1177      +/-   ##
==========================================
+ Coverage   81.16%   81.20%   +0.03%     
==========================================
  Files         136      136              
  Lines       11447    11447              
==========================================
+ Hits         9291     9295       +4     
+ Misses       1631     1628       -3     
+ Partials      525      524       -1     

Flag	Coverage Δ
integration-test	57.01% <ø> (-0.04%)	⬇️
k8s-integration-test	58.87% <ø> (+0.13%)	⬆️
oats-test	35.81% <ø> (ø)
unittests	53.57% <ø> (-0.02%)	⬇️

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[grcevski]

LGTM! Nice!