Merge CollectionService into DiscoveryService

[caendesilva]

The collection service's name doesn't sit right with me. It doesn't actually deal with (Laravel) collections, just arrays. But it's integral to the Hyde auto-discovery process. And since the DiscoveryService class was deprecated anyways, why not merge them? Next step is to clean up the class and remove deprecated methods, but that's an other PR.

[codecov]

Codecov Report

Merging #290 (4d1d89e) into master (522b190) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master      #290   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       811       811           
===========================================
  Files             97        96    -1     
  Lines           2029      2029           
===========================================
  Hits            2029      2029           

Impacted Files	Coverage Δ
.../Actions/GeneratesDocumentationSearchIndexFile.php	100.00% <100.00%> (ø)
.../framework/src/Commands/HydeBuildSearchCommand.php	100.00% <100.00%> (ø)
...mework/src/Commands/HydeBuildStaticSiteCommand.php	100.00% <100.00%> (ø)
.../Internal/TransfersMediaAssetsForBuildCommands.php	100.00% <100.00%> (ø)
packages/framework/src/Contracts/AbstractPage.php	100.00% <100.00%> (ø)
packages/framework/src/Services/BuildService.php	100.00% <100.00%> (ø)
...ckages/framework/src/Services/DiscoveryService.php	100.00% <100.00%> (ø)
...kages/framework/src/Services/ValidationService.php	100.00% <100.00%> (ø)

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