Embedded entity's fields conflict with the parent ones even using columnPrefix

[roxblnfk]

Fix #23
Todo:

• Add test case
• Resolve proplem

[codecov]

Codecov Report

Merging #24 (22dfcdc) into master (005c71b) will increase coverage by 2.25%.
The diff coverage is 60.00%.

@@             Coverage Diff              @@
##             master      #24      +/-   ##
============================================
+ Coverage     89.11%   91.36%   +2.25%     
- Complexity      398      426      +28     
============================================
  Files            31       33       +2     
  Lines          1001     1065      +64     
============================================
+ Hits            892      973      +81     
+ Misses          109       92      -17     

Impacted Files	Coverage Δ	Complexity Δ
...ion/FieldException/EmbeddedPrimaryKeyException.php	33.33% <33.33%> (ø)	4.00 <4.00> (?)
src/Definition/Map/FieldMap.php	100.00% <100.00%> (+14.28%)	10.00 <0.00> (ø)
src/Relation/Embedded.php	100.00% <100.00%> (+100.00%)	5.00 <0.00> (+1.00)
src/Compiler.php	86.41% <0.00%> (-6.12%)	31.00% <0.00%> (+5.00%)	⬇️
src/Definition/Comparator/FieldComparator.php	100.00% <0.00%> (ø)	18.00% <0.00%> (?%)
src/Registry.php	90.21% <0.00%> (+2.17%)	42.00% <0.00%> (ø%)
src/Generator/RenderTables.php	84.61% <0.00%> (+3.84%)	12.00% <0.00%> (ø%)
src/Definition/Field.php	100.00% <0.00%> (+5.40%)	17.00% <0.00%> (ø%)
src/Definition/Entity.php	96.66% <0.00%> (+6.66%)	37.00% <0.00%> (ø%)
... and 3 more

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