Breaking: Change default DataCollection directory from _data to resources/collections

[caendesilva]

Moving the (default) _data directory to resources/collections accomplishes two things:

1. Makes the top level directory structure leaner (which also distinguishes it from page directories.
2. The name collections makes more semantic sense for the usage, and I think the kind of data used fits within the resources domain too.
   The directory is configurable, so this is just the defaults.

Any existing sites will need to move their data before upgrading. This is as easy as mv -r _data resources/collections

Tracked in #877

[codecov]

Codecov Report

Merging #879 (a757943) into master (0c07b56) will not change coverage.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##              master      #879     +/-   ##
=============================================
  Coverage     100.00%   100.00%             
- Complexity      1257      2514   +1257     
=============================================
  Files            147       294    +147     
  Lines           3288      6576   +3288     
=============================================
+ Hits            3288      6576   +3288     

Impacted Files	Coverage Δ
...mework/Features/DataCollections/DataCollection.php	100.00% <ø> (ø)
.../DataCollections/DataCollectionServiceProvider.php	100.00% <100.00%> (ø)
...src/Framework/Exceptions/FileConflictException.php	100.00% <0.00%> (ø)
...es/framework/src/Framework/HydeServiceProvider.php	100.00% <0.00%> (ø)
.../packages/framework/src/Support/Facades/Render.php	100.00% <0.00%> (ø)
...ges/framework/src/Support/Filesystem/MediaFile.php	100.00% <0.00%> (ø)
...amework/src/Framework/Services/ChecksumService.php	100.00% <0.00%> (ø)
...amework/src/Framework/Actions/SourceFileParser.php	100.00% <0.00%> (ø)
...rk/Features/Blogging/Models/LocalFeaturedImage.php	100.00% <0.00%> (ø)
...rk/src/Framework/Features/Metadata/MetadataBag.php	100.00% <0.00%> (ø)
... and 139 more

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