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 98.21%. Comparing base (2adfe25) to head (9364c4b).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #353      +/-   ##
============================================
+ Coverage     98.16%   98.21%   +0.05%     
- Complexity      228      233       +5     
============================================
  Files            20       20              
  Lines           707      727      +20     
============================================
+ Hits            694      714      +20     
  Misses           13       13              

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