Sparse Ops: Indexing with slice

[jimjlu99]

🔨Work Item

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Project tracker: https://github.com/orgs/dmlc/projects/2

Description

Indexing:

• A[i] or A[I] or A[I, :], row slicing, return sliced submatrix (sparse)
• A[:, j] or A[:, J], column slicing, return sliced submatrix (sparse)

Depending work items or issues

[github-actions[bot]]

This issue has been automatically marked as stale due to lack of activity. It will be closed if no further activity occurs. Thank you