Sparse row optimizer

[Twolvero]

This is the optimizer for the sparse row templates.

[codecov]

Codecov Report

❌ Patch coverage is 77.03769% with 262 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.56%. Comparing base (38b73ae) to head (63aac6b).
⚠️ Report is 44 commits behind head on main.

Files with missing lines	Patch %	Lines
...ache/sysds/runtime/codegen/LibSpoofPrimitives.java	83.90%	108 Missing and 34 partials ⚠️
...g/apache/sysds/hops/codegen/cplan/CNodeBinary.java	31.57%	25 Missing and 27 partials ⚠️
...g/apache/sysds/hops/codegen/cplan/java/Binary.java	29.03%	18 Missing and 4 partials ⚠️
...org/apache/sysds/runtime/codegen/SpoofRowwise.java	50.00%	8 Missing and 4 partials ⚠️
...rg/apache/sysds/hops/codegen/cplan/CNodeUnary.java	66.66%	3 Missing and 4 partials ⚠️
...ava/org/apache/sysds/hops/codegen/cplan/CNode.java	40.00%	2 Missing and 4 partials ⚠️
...parser/ParameterizedBuiltinFunctionExpression.java	54.54%	3 Missing and 2 partials ⚠️
.../apache/sysds/hops/codegen/cplan/CNodeTernary.java	20.00%	0 Missing and 4 partials ⚠️
...rc/main/java/org/apache/sysds/hops/AggUnaryOp.java	84.21%	2 Missing and 1 partial ⚠️
...org/apache/sysds/hops/codegen/cplan/CNodeNary.java	33.33%	1 Missing and 1 partial ⚠️
... and 4 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2297      +/-   ##
============================================
- Coverage     72.94%   72.56%   -0.39%     
- Complexity    46070    46632     +562     
============================================
  Files          1479     1492      +13     
  Lines        172616   176042    +3426     
  Branches      33783    34576     +793     
============================================
+ Hits         125922   127737    +1815     
- Misses        37202    38660    +1458     
- Partials       9492     9645     +153     

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[mboehm7]

LGTM - thanks for this substantial contribution and the related effort @Frxms. During the merge, I rebased the 60+ commits, resolved all merge conflicts, added the missing license headers (that's why the license check was failing), resolved warnings, and left a few TODOs for future cleanups. That completes this feature and I'll also close the remaining PRs which are subsets of this one.