Feature/issue 74 execute action

[alexjbush]

Description

This adds withExecutor and execute functions onto DataFlows allowing DataFlows to be executed inline without needing to create an Executor explicitly and call execute.

Fixes #74

Type of change

Please delete options that are not relevant.

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

How Has This Been Tested?

Unit tests

[codecov-io]

Codecov Report

Merging #79 into develop will increase coverage by 0.03%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop      #79      +/-   ##
===========================================
+ Coverage    81.95%   81.98%   +0.03%     
===========================================
  Files           56       56              
  Lines         1585     1588       +3     
  Branches        66       67       +1     
===========================================
+ Hits          1299     1302       +3     
  Misses         286      286

Impacted Files	Coverage Δ
...autodata/waimak/dataflow/spark/SparkDataFlow.scala	87.32% <100%> (+0.36%)	:arrow_up:
...ala/com/coxautodata/waimak/dataflow/DataFlow.scala	95.62% <100%> (+0.03%)	:arrow_up:

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