Print printable characters in cfg.ProtocolDebug

[mariomac]

ProtoDebug=true shows messages in binary format, which are useful for binary buffers but not really for printable text.

Replacing %v by %q so it will show printable characters as text, and non-printable characters as escaped char codes.

Example: https://go.dev/play/p/GVXC3OIu5q9?v=

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 66.98%. Comparing base (6a9c97d) to head (947a76e).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/internal/ebpf/common/tcp_detect_transform.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1738   +/-   ##
=======================================
  Coverage   66.98%   66.98%           
=======================================
  Files         214      214           
  Lines       22225    22225           
=======================================
+ Hits        14887    14888    +1     
  Misses       6602     6602           
+ Partials      736      735    -1     

Flag	Coverage Δ
integration-test	54.10% <0.00%> (-0.22%)	⬇️
k8s-integration-test	53.89% <0.00%> (+0.03%)	⬆️
oats-test	34.75% <0.00%> (ø)
unittests	43.87% <0.00%> (ø)

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