Track clones for context propagation

[grcevski]

This change helps us track server->client inside a process when the applications use real threads for this. Some examples might include Java SpringBoot using spring RestClient and Rust Actix using reqwest.

The idea is exactly the same as how we track the goroutine parent -> child relationships, except we here track sys_clone and sys_exit.

TODO:

• Integration tests

[codecov-commenter]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (72a0ed9) 79.94% compared to head (0af5fb6) 45.02%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
pkg/internal/ebpf/httpfltr/httpfltr.go	0.00%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #560       +/-   ##
===========================================
- Coverage   79.94%   45.02%   -34.93%     
===========================================
  Files          69       67        -2     
  Lines        5830     5664      -166     
===========================================
- Hits         4661     2550     -2111     
- Misses        946     2964     +2018     
+ Partials      223      150       -73     

Flag	Coverage Δ
integration-test	?
unittests	45.02% <0.00%> (+0.01%)	⬆️

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[mariomac]

Amazing