Feature/max executors for waimak apps

[vavison]

Description

Allows a maximum number of parallel actions to be set for WaimakApp instances. Also promotes the changes initially added in https://github.com/CoxAutomotiveDataSolutions/waimak/pull/67 to a new module called waimak-app

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

[codecov-io]

Codecov Report

Merging #81 into develop will increase coverage by 0.01%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop      #81      +/-   ##
===========================================
+ Coverage    82.03%   82.04%   +0.01%     
===========================================
  Files           56       56              
  Lines         1592     1593       +1     
  Branches        62       62              
===========================================
+ Hits          1306     1307       +1     
  Misses         286      286

Impacted Files	Coverage Δ
...la/com/coxautodata/waimak/spark/app/SparkApp.scala	100% <ø> (ø)
.../coxautodata/waimak/spark/app/MultiAppRunner.scala	88.23% <ø> (ø)
...autodata/waimak/spark/app/EnvironmentManager.scala	75% <ø> (ø)
...n/scala/com/coxautodata/waimak/spark/app/Env.scala	90.62% <100%> (ø)
...a/com/coxautodata/waimak/spark/app/WaimakApp.scala	100% <100%> (ø)

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