:fix: Credential Marshalling

[dseurotech]

xml annotations on CredentialImpl were overriding the ones on Credential, preventing XmlJavaTypeAdapters from being calle
d

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 16.78%. Comparing base (839d04d) to head (2fbb818).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #4053      +/-   ##
=============================================
- Coverage      16.78%   16.78%   -0.01%     
  Complexity        22       22              
=============================================
  Files           2006     2006              
  Lines          52087    52089       +2     
  Branches        4383     4384       +1     
=============================================
  Hits            8745     8745              
- Misses         42947    42949       +2     
  Partials         395      395              

Files	Coverage Δ
...entication/credential/mfa/shiro/MfaOptionImpl.java	100.00% <ø> (ø)
...tication/credential/mfa/shiro/ScratchCodeImpl.java	100.00% <ø> (ø)
...uthentication/credential/shiro/CredentialImpl.java	100.00% <ø> (ø)

... and 2 files with indirect coverage changes