Move layout logic into the collection view factory

[cerihughes]

Create a collection view layout in the collection view factory when we create the collection view, and absolve the view controller of that responsibility. The VC now also doesn't need to create a "temporary" UICollectionViewLayout class for the collection view.

[spotify-ci-bot]

	3 Messages
📖	Executed 383 tests, with 0 failures (0 unexpected) in 6.960 (7.509) seconds
📖	Executed 379 tests, with 0 failures (0 unexpected) in 6.604 (7.246) seconds
📖	Executed 11 tests, with 0 failures (0 unexpected) in 212.274 (212.282) seconds

Generated by 🚫 Danger

[codecov-io]

Codecov Report

Merging #331 into master will decrease coverage by 0.37%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #331      +/-   ##
=========================================
- Coverage   80.57%   80.2%   -0.38%     
=========================================
  Files          84      84              
  Lines        5659    4500    -1159     
=========================================
- Hits         4560    3609     -951     
+ Misses       1099     891     -208

Impacted Files	Coverage Δ
...rces/HUBViewControllerExperimentalImplementation.m	4.68% <ø> (-0.13%)	⬇️
sources/HUBViewControllerImplementation.m	88.3% <ø> (-1.82%)	⬇️
sources/HUBConfigViewControllerFactory.m	96.66% <100%> (-0.71%)	⬇️
sources/HUBViewControllerFactoryImplementation.m	100% <100%> (ø)	⬆️
sources/HUBCollectionViewFactory.m	100% <100%> (ø)	⬆️
sources/HUBLiveServiceFactory.m	75% <0%> (-5%)	⬇️
sources/HUBComponentUIStateManager.m	85.71% <0%> (-3.18%)	⬇️
sources/HUBLiveServiceImplementation.m	81.39% <0%> (-2.92%)	⬇️
sources/HUBIdentifier.m	91.66% <0%> (-2.09%)	⬇️
sources/HUBCollectionContainerView.m	90.9% <0%> (-1.95%)	⬇️
... and 70 more

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