Implement PGP keeper encrypt

[rossnelson]

• Implement PGP Encrypt
• remove junit

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 42.44%. Comparing base (db8b3c8) to head (bff9d01).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
cryptkeeper/keepers/pgp/pgp.go	80.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   41.98%   42.44%   +0.45%     
==========================================
  Files         110      110              
  Lines        3942     3956      +14     
==========================================
+ Hits         1655     1679      +24     
+ Misses       2184     2172      -12     
- Partials      103      105       +2     

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