[BWARE] Add HashMapIntToInt primitive int-to-int hash map

[Baunsgaard]

Introduce a specialized open-addressing map storing primitive int keys and values, avoiding boxing for integer-to-integer lookups used by compressed column-group operations.

[codecov]

Codecov Report

❌ Patch coverage is 99.31973% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 71.41%. Comparing base (88c26e2) to head (b2dc051).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
.../sysds/runtime/compress/utils/HashMapIntToInt.java	99.31%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2478      +/-   ##
============================================
+ Coverage     71.37%   71.41%   +0.03%     
- Complexity    48749    48814      +65     
============================================
  Files          1571     1572       +1     
  Lines        188912   189059     +147     
  Branches      37067    37097      +30     
============================================
+ Hits         134845   135010     +165     
+ Misses        43601    43591      -10     
+ Partials      10466    10458       -8     

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