Component routing

[yann-eugone]

The idea behind "routing" is : "the ability to pick the appropriate component for a given subject".

Routing is a "generic" behaviour which can be leveraged at many places in the app.

I started with an implementation for ItemProcessor & ItemWriter.

[codecov]

Codecov Report

Merging #20 (abf58ba) into 0.x (d8d73b5) will increase coverage by 4.91%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                0.x      #20      +/-   ##
============================================
+ Coverage     83.52%   88.44%   +4.91%     
- Complexity      477      517      +40     
============================================
  Files            66       75       +9     
  Lines          1360     1515     +155     
============================================
+ Hits           1136     1340     +204     
+ Misses          224      175      -49     

Impacted Files	Coverage Δ
src/batch/src/Finder/CallbackFinder.php	100.00% <100.00%> (ø)
src/batch/src/Finder/ClassMapFinder.php	100.00% <100.00%> (ø)
.../batch/src/Job/Item/Processor/RoutingProcessor.php	100.00% <100.00%> (ø)
src/batch/src/Job/Item/Writer/RoutingWriter.php	100.00% <100.00%> (ø)
src/batch/src/Test/Finder/DummyFinder.php	100.00% <100.00%> (ø)
...src/Test/Job/Item/Processor/TestDebugProcessor.php	100.00% <100.00%> (ø)
...batch/src/Test/Job/Item/Reader/TestDebugReader.php	100.00% <100.00%> (ø)
src/batch/src/Test/Job/Item/TestDebugComponent.php	100.00% <100.00%> (ø)
...batch/src/Test/Job/Item/Writer/TestDebugWriter.php	100.00% <100.00%> (ø)
... and 12 more

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