Refactor populateRecord() to split ArrayAccess implementation

[Tigrov]

Q	A
Is bugfix?	✔️/❌
New feature?	❌
Breaks BC?	❌
Fixed issues	#308

[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 87.43%. Comparing base (804ca3f) to head (98295c7).

Files	Patch %	Lines
src/ArArrayHelper.php	62.50%	3 Missing ⚠️
src/AbstractActiveRecord.php	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #350      +/-   ##
============================================
- Coverage     88.13%   87.43%   -0.71%     
- Complexity      597      601       +4     
============================================
  Files            13       13              
  Lines          1374     1385      +11     
============================================
  Hits           1211     1211              
- Misses          163      174      +11     

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