[OOC] Add OOCPackedCache

[janniklinde]

This PR adds a new OOCCache implementation that supports packing small tiles together into one logical cache entry.

[codecov]

Codecov Report

❌ Patch coverage is 63.09859% with 262 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.60%. Comparing base (afe793a) to head (3539bd9).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...sysds/runtime/ooc/cache/packed/OOCPackedCache.java	63.53%	105 Missing and 54 partials ⚠️
...sysds/runtime/ooc/cache/packed/PackedPinState.java	67.14%	35 Missing and 11 partials ⚠️
...he/sysds/runtime/ooc/cache/packed/PackedBlock.java	17.85%	23 Missing ⚠️
...he/sysds/runtime/ooc/cache/packed/PackBuilder.java	67.69%	15 Missing and 6 partials ⚠️
.../runtime/ooc/cache/packed/PackedCacheLocation.java	68.18%	4 Missing and 3 partials ⚠️
.../runtime/ooc/cache/io/SpillableObjectRegistry.java	0.00%	3 Missing ⚠️
...ds/runtime/ooc/cache/packed/PackedUnpinHandle.java	81.25%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2534      +/-   ##
============================================
+ Coverage     71.59%   71.60%   +0.01%     
- Complexity    49684    49851     +167     
============================================
  Files          1596     1602       +6     
  Lines        192298   193007     +709     
  Branches      37675    37787     +112     
============================================
+ Hits         137680   138209     +529     
- Misses        43909    44017     +108     
- Partials      10709    10781      +72     

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