Create TransactionalTrait

[Tigrov]

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

[codecov]

Codecov Report

Attention: Patch coverage is 79.54545% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 88.25%. Comparing base (537eca7) to head (9803ee8).

Files	Patch %	Lines
src/Trait/TransactionalTrait.php	83.33%	7 Missing ⚠️
src/AbstractActiveRecord.php	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #320      +/-   ##
============================================
+ Coverage     86.98%   88.25%   +1.27%     
- Complexity      576      577       +1     
============================================
  Files            11       12       +1     
  Lines          1314     1320       +6     
============================================
+ Hits           1143     1165      +22     
+ Misses          171      155      -16     

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