Enable different request for frc in subscriptions

[roanutil]

There are cases where change tracking can't work with the full predicate used for fetching. We've run into an instance of that with Align. Allowing different predicates for fetching and change tracking is the best way forward.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.61672% with 68 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.29%. Comparing base (e5ec1cc) to head (05c01ab).

Files with missing lines	Patch %	Lines
Tests/CoreDataRepositoryTests/AggregateTests.swift	94.60%	30 Missing ⚠️
...ataRepository/Internal/AggregateSubscription.swift	58.82%	14 Missing ⚠️
...itory/Internal/AggregateThrowingSubscription.swift	58.82%	14 Missing ⚠️
Tests/CoreDataRepositoryTests/FetchTests.swift	93.54%	6 Missing ⚠️
...oreDataRepository/Internal/CountSubscription.swift	88.23%	2 Missing ⚠️
...epository/Internal/CountThrowingSubscription.swift	89.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   84.07%   85.29%   +1.22%     
==========================================
  Files          69       69              
  Lines        7654     8528     +874     
==========================================
+ Hits         6435     7274     +839     
- Misses       1219     1254      +35     

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