Realize Schema::loadResultColumn() method

[Tigrov]

Related PR

• Add option for typecasting values retrieved from DB. db#945

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 98.78%. Comparing base (0714827) to head (0d424e1).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #387      +/-   ##
============================================
+ Coverage     98.69%   98.78%   +0.09%     
- Complexity      171      182      +11     
============================================
  Files            16       16              
  Lines           535      578      +43     
============================================
+ Hits            528      571      +43     
  Misses            7        7              

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