Add doctrine ObjectRegistry that remember object identities

[yann-eugone]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (bb81f79) 99.67% compared to head (3c3f912) 99.68%.

Additional details and impacted files

@@            Coverage Diff            @@
##                0.x      #70   +/-   ##
=========================================
  Coverage     99.67%   99.68%           
- Complexity      794      801    +7     
=========================================
  Files           134      135    +1     
  Lines          2172     2196   +24     
=========================================
+ Hits           2165     2189   +24     
  Misses            7        7           

Impacted Files	Coverage Δ
.../batch-doctrine-persistence/src/ObjectRegistry.php	100.00% <100.00%> (ø)

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[halundraN]

Ok in principle.
But warning, this kind of feature has already caused me some problems.
Especially in the case of an entityManager#clear which does not clear the repository object.
All object in the ObjectRepository would be considere as new.

[yann-eugone]

But here, the registry never remember objects, only identities.
If you call ObjectManager::clear during a job of yours, all objects will be detached, and when you will call the ObjectRegistry::*, instead of running a multi-criteria query, the object will be found using it's identity: more efficient query (and if object is already hydrated, no query at all)