Avoid final classes for jobs but add final to methods

[yann-eugone]

No description provided.

[codecov]

Codecov Report

Merging #31 (2dbc4be) into 0.x (b2e6a7d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##                0.x      #31   +/-   ##
=========================================
  Coverage     92.56%   92.56%           
  Complexity      592      592           
=========================================
  Files            96       96           
  Lines          1721     1721           
=========================================
  Hits           1593     1593           
  Misses          128      128           

Impacted Files	Coverage Δ
src/batch/src/Job/AbstractJob.php	86.66% <100.00%> (ø)
src/batch/src/Job/Item/ItemJob.php	100.00% <100.00%> (ø)
src/batch/src/Job/JobWithChildJobs.php	100.00% <100.00%> (ø)
src/batch/src/JobExecutionLogger.php	100.00% <0.00%> (ø)

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