Implement the ability for user-defined type casting

[Tigrov]

Related PR

• Implement the ability for user-defined type casting db#941

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.48%. Comparing base (18526b2) to head (d251b95).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #346      +/-   ##
============================================
- Coverage     98.48%   98.48%   -0.01%     
  Complexity      332      332              
============================================
  Files            21       21              
  Lines          1057     1056       -1     
============================================
- Hits           1041     1040       -1     
  Misses           16       16              

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