Add ActiveRecordInterface::isChanged() method

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	✔️
Fixed issues	#10

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.97%. Comparing base (b9d4f2a) to head (ae0ea10).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #400      +/-   ##
============================================
+ Coverage     87.95%   87.97%   +0.01%     
- Complexity      570      571       +1     
============================================
  Files            16       16              
  Lines          1362     1364       +2     
============================================
+ Hits           1198     1200       +2     
  Misses          164      164              

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[vjik]

Just idea… Merge isChanged() and isPropertyChanged(string $name) to single isChanged(?string $name = null). WDYT?