Array associations

[lickel]

The functional change here allows for Array associations that do not use the ID.
Uses for this would be if (for example) the source entity exposes a list of encoded IDs.

The only requirement to enable this is to pass a closure for the associated entity to expose the reference.

[codecov-commenter]

Codecov Report

Merging #37 (b63c58e) into main (720319b) will increase coverage by 0.00%.
The diff coverage is 90.24%.

@@           Coverage Diff           @@
##             main      #37   +/-   ##
=======================================
  Coverage   90.83%   90.84%           
=======================================
  Files          30       30           
  Lines        4901     4924   +23     
=======================================
+ Hits         4452     4473   +21     
- Misses        449      451    +2     

Impacted Files	Coverage Δ
...s/Sources/Requests/PaginatingFetchDefinition.swift	91.66% <ø> (ø)
...ibleSectionsFetchedResultsControllerTestCase.swift	99.15% <ø> (ø)
...Controllers/FetchedResultsControllerTestCase.swift	100.00% <ø> (ø)
FetchRequests/Tests/TestObject+Associations.swift	73.39% <ø> (ø)
FetchRequests/Tests/TestObject.swift	89.47% <ø> (ø)
.../Controller/FetchedResultsControllerProtocol.swift	81.31% <33.33%> (ø)
.../Sources/Controller/FetchedResultsController.swift	81.15% <66.66%> (ø)
.../CollapsibleSectionsFetchedResultsController.swift	86.85% <75.00%> (-0.41%)	⬇️
...tchRequests/Sources/SwiftUI/FetchableRequest.swift	88.05% <83.33%> (ø)
...Sources/Associations/FetchRequestAssociation.swift	76.44% <97.14%> (+0.93%)	⬆️
... and 4 more

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