Fixes problem with JTI and STI

[butschster]

STI annotation wrong detected parent entity

• Adds functional tests for JTI
• Adds additional test for STI with third inheritance level

[butschster]

To fix tests we need solve problem with SqlServer and JTI https://appuals.com/how-to-fix-the-error-cannot-insert-explicit-value-for-identity-column-in-table-when-identity_insert-is-set-to-off/

[codecov[bot]]

Codecov Report

Merging #39 (4dd2949) into 2.0 (bdf7662) will increase coverage by 0.00%. The diff coverage is 93.10%.

@@            Coverage Diff            @@
##                2.0      #39   +/-   ##
=========================================
  Coverage     90.39%   90.40%           
- Complexity      229      234    +5     
=========================================
  Files            32       32           
  Lines           552      573   +21     
=========================================
+ Hits            499      518   +19     
- Misses           53       55    +2     

Impacted Files	Coverage Δ
src/TableInheritance.php	92.40% <85.71%> (-1.63%)	:arrow_down:
src/Configurator.php	84.37% <100.00%> (+0.50%)	:arrow_up:
src/Entities.php	96.96% <100.00%> (-0.37%)	:arrow_down:
src/Utils/EntityUtils.php	86.36% <100.00%> (+5.11%)	:arrow_up:
src/Annotation/Relation/Relation.php	89.47% <0.00%> (+7.65%)	:arrow_up:

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