pathfinder rules: added unencrypted socket connection detection rule

[shivasurya]

This pathfinder rule helps detecting unencrypted socket, serversocket connections in source code.

example:

Socket socket = new Socket("host", 8080)

ServerSocket ss = new ServerSocket("host", 8000)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.61%. Comparing base (5415090) to head (d6ba012).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #143   +/-   ##
=======================================
  Coverage   77.61%   77.61%           
=======================================
  Files          12       12           
  Lines        1492     1492           
=======================================
  Hits         1158     1158           
  Misses        299      299           
  Partials       35       35           

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