Add ContactAllowedValidator and ContactResultValidator

[Levi-Armstrong]

Remove use of function pointers and leverages classes which can be serialized.

[Levi-Armstrong]

Address #1093

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.05%. Comparing base (16a4193) to head (97b1c22).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1095      +/-   ##
==========================================
- Coverage   89.24%   89.05%   -0.19%     
==========================================
  Files         289      294       +5     
  Lines       16377    16432      +55     
==========================================
+ Hits        14615    14633      +18     
- Misses       1762     1799      +37     

see 24 files with indirect coverage changes