Add OOCMatrixBlockTracker

[jessicapriebe]

Add OOCMatrixBlockTracker for encapsulating count maintenance and early block emission

[codecov]

Codecov Report

❌ Patch coverage is 0% with 51 lines in your changes missing coverage. Please review.
✅ Project coverage is 22.00%. Comparing base (2cb1a60) to head (b17359e).
⚠️ Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
...sysds/runtime/instructions/ooc/OOCInstruction.java	0.00%	23 Missing ⚠️
...instructions/ooc/AggregateUnaryOOCInstruction.java	0.00%	19 Missing ⚠️
...ructions/ooc/MatrixVectorBinaryOOCInstruction.java	0.00%	9 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #2318       +/-   ##
=============================================
- Coverage     72.25%   22.00%   -50.26%     
+ Complexity    46625    14808    -31817     
=============================================
  Files          1495     1496        +1     
  Lines        176829   176884       +55     
  Branches      34766    34772        +6     
=============================================
- Hits         127772    38925    -88847     
- Misses        39402   134553    +95151     
+ Partials       9655     3406     -6249     

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[mboehm7]

LGTM - thanks for the patch @jessicapriebe. This aggregation utility is great and I only slightly changed the naming of member variables.