Feature/add unmanaged protocol for types that prefer a unique id other than object

[roanutil]

Major refactor of the v3.0 preview code

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.91864% with 925 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.32%. Comparing base (dc094d0) to head (f12cee7).
⚠️ Report is 50 commits behind head on 3.0-preview.

Files with missing lines	Patch %	Lines
.../Internal/ModelsWithIntId/ManagedIdModel_Int.swift	0.00%	110 Missing ⚠️
...ternal/ModelsWithIntId/ManagedIdUrlModel_Int.swift	0.00%	110 Missing ⚠️
...nternal/ModelsWithUuidId/UnmanagedModel_Uuid.swift	0.00%	88 Missing ⚠️
.../Internal/ModelsWithIntId/UnmanagedModel_Int.swift	0.00%	75 Missing ⚠️
...ternal/ModelsWithIntId/IdentifiableModel_Int.swift	0.00%	66 Missing ⚠️
.../Internal/ModelsWithIntId/FetchableModel_Int.swift	0.00%	61 Missing ⚠️
Sources/Internal/CoreDataStack.swift	48.00%	52 Missing ⚠️
...nternal/ModelsWithUuidId/ManagedIdModel_Uuid.swift	62.72%	41 Missing ⚠️
...s/CoreDataRepository/CoreDataRepository+Read.swift	81.00%	38 Missing ⚠️
...DataRepository/CoreDataRepository+Read_Batch.swift	72.16%	27 Missing ⚠️
... and 24 more

Additional details and impacted files

@@               Coverage Diff               @@
##           3.0-preview      #30      +/-   ##
===============================================
- Coverage        84.26%   82.32%   -1.94%     
===============================================
  Files               35       65      +30     
  Lines             2936     7311    +4375     
===============================================
+ Hits              2474     6019    +3545     
- Misses             462     1292     +830     

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