Feature/using f bounded types

[vavison]

Description

Using F-bounded types (https://tpolecat.github.io/2015/04/29/f-bounds.html) instead of using this.type which has been causing us problems for a long time.

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] 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?

Existing tests are all passing

[codecov-io]

Codecov Report

Merging #84 into develop will decrease coverage by 0.01%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop      #84      +/-   ##
===========================================
- Coverage    82.12%   82.11%   -0.02%     
===========================================
  Files           56       56              
  Lines         1600     1599       -1     
  Branches        63       63              
===========================================
- Hits          1314     1313       -1     
  Misses         286      286

Impacted Files	Coverage Δ
...autodata/waimak/dataflow/spark/SparkDataFlow.scala	87.32% <100%> (ø)	:arrow_up:
...a/waimak/dataflow/spark/ParquetDataCommitter.scala	98.33% <100%> (ø)	:arrow_up:
...ala/com/coxautodata/waimak/dataflow/DataFlow.scala	95.58% <100%> (-0.04%)	:arrow_down:
...coxautodata/waimak/dataflow/DataFlowExecutor.scala	96.96% <100%> (ø)	:arrow_up:

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