First draft on getting User-Agent string

[AndrewQuijano]

Your checklist for this pull request

• I've documented or updated the documentation of every function this PR changes
• I've added tests that prove my fix is effective or that my feature works (if possible)

Detailed description

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Test plan

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Closing issues

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 20.08%. Comparing base (d395a8c) to head (c41f76f).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/libinspector/packet_processor.py	0.00%	34 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
- Coverage   20.83%   20.08%   -0.75%     
==========================================
  Files          17       17              
  Lines         888      921      +33     
==========================================
  Hits          185      185              
- Misses        703      736      +33     

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