flags(signatures): new flag format

[josedonizetti]

1. Explain what the PR does

"Replace me with make check-pr output"

2. Explain how to test it

3. Other comments

[codecov]

Codecov Report

❌ Patch coverage is 64.06250% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.79%. Comparing base (034cbab) to head (d8c9820).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/tracee/cmd/list.go	20.00%	8 Missing ⚠️
cmd/tracee/cmd/analyze.go	30.00%	7 Missing ⚠️
pkg/cmd/cobra/cobra.go	0.00%	5 Missing ⚠️
cmd/tracee/cmd/root.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5022      +/-   ##
==========================================
+ Coverage   29.72%   29.79%   +0.06%     
==========================================
  Files         234      229       -5     
  Lines       26186    25601     -585     
==========================================
- Hits         7785     7627     -158     
+ Misses      17864    17448     -416     
+ Partials      537      526      -11     

Flag	Coverage Δ
unit	29.79% <64.06%> (+0.06%)	⬆️

Files with missing lines	Coverage Δ
pkg/cmd/cobra/config.go	89.76% <100.00%> (+0.37%)	⬆️
pkg/cmd/flags/signatures.go	100.00% <100.00%> (ø)
cmd/tracee/cmd/root.go	0.00% <0.00%> (ø)
pkg/cmd/cobra/cobra.go	0.00% <0.00%> (ø)
cmd/tracee/cmd/analyze.go	31.49% <30.00%> (-1.03%)	⬇️
cmd/tracee/cmd/list.go	37.14% <20.00%> (-6.20%)	⬇️

... and 6 files with indirect coverage changes

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