Refactor - Abstract ScalingConfiguration

[eytan-avisror]

Ref #17
Fixes #163

This abstracts the concrete launch configuration state/provisioner into an interface called ScalingConfiguration which can create multiple types of configurations.

Added the implementation of a LaunchConfiguration type and refactored the code & tests to use that instead of existing implementation.

This will allow to create a new ScalingConfiguration type later called LaunchTemplate

• BDD passing
• Manual testing

[codecov]

Codecov Report

Merging #165 into master will increase coverage by 0.50%.
The diff coverage is 96.38%.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   89.41%   89.92%   +0.50%     
==========================================
  Files          13       15       +2     
  Lines        1654     1647       -7     
==========================================
+ Hits         1479     1481       +2     
+ Misses        113      108       -5     
+ Partials       62       58       -4     

Impacted Files	Coverage Δ
controllers/provisioners/config.go	73.98% <ø> (-0.21%)	⬇️
controllers/provisioners/eks/state.go	92.85% <ø> (ø)
controllers/provisioners/eksfargate/eksfargate.go	93.91% <ø> (-0.13%)	⬇️
controllers/provisioners/eksmanaged/eksmanaged.go	84.41% <ø> (+2.65%)	⬆️
controllers/provisioners/eks/cloud.go	89.28% <87.50%> (+3.39%)	⬆️
...ntrollers/provisioners/eks/scaling/launchconfig.go	95.30% <95.30%> (ø)
controllers/provisioners/eks/create.go	95.50% <100.00%> (+2.73%)	⬆️
controllers/provisioners/eks/delete.go	96.36% <100.00%> (+0.90%)	⬆️
controllers/provisioners/eks/helpers.go	89.38% <100.00%> (-0.72%)	⬇️
controllers/provisioners/eks/update.go	93.49% <100.00%> (-3.11%)	⬇️
... and 6 more

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