feat: added PURL generation to ruby parser

[inosmeet]

Related: #3771.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 78.79%. Comparing base (d6cbe40) to head (69555c5).
Report is 110 commits behind head on main.

Files	Patch %	Lines
cve_bin_tool/parsers/ruby.py	25.00%	11 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3939      +/-   ##
==========================================
+ Coverage   75.41%   78.79%   +3.37%     
==========================================
  Files         808      818      +10     
  Lines       11983    12203     +220     
  Branches     1598     1430     -168     
==========================================
+ Hits         9037     9615     +578     
+ Misses       2593     2155     -438     
- Partials      353      433      +80     

Flag	Coverage Δ
longtests	?
win-longtests	78.79% <25.00%> (?)

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[terriko]

Let's get this merged now. thanks!