[SYSTEMDS-3948] Row-wise Sparsity Estimator#2466

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ywcb00 wants to merge 10 commits intoapache:mainfrom

ywcb00:feat/sparsity/estim/rs

Commits on May 11, 2026

feat(EstimatorRowWise.java): implement the first version of the row wise sparsity estimator
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feat(test/estim): add some tests for the row wise sparsity estimator to the unity tests for sparsity estimation
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feat(hops/estim/EstimatorRowWise.java): introduce a separate object container for row wise sparsity vectors to simplify access and allow storing it with chain nodes
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fix(hops/estim/EstimatorRowWise.java): fix derivation of output data characteristics
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feat(test/component/estim): add unit tests for row wise sparsity estimator with element-wise and single operations
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feat(main/hops/estim/EstimatorRowWise.java): add support for element-wise and single operations
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feat(main/hops/estim/EstimatorRowWise.java): support sparsity estimation for diagonal operation
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feat(test/component/estim/OpSingleTest.java): add test cases for eqzero and diag (mv and vm) operations with the row-wise sparsity estimator
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refactor(main/hops/estim/EstimatorRowWise.java): refactor switch case to consolidate all calls to getters before the switch
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refactor(main/hops/estim/EstimatorRowWise.java): remove wrapper class for row-wise sparsity vector and apply the corresponding operations directly in the code instead
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