Start to work on matrix testing
Add test cases for basic matrix manipulations (in-memory dense matrix and
in-row-format dense matrix)
Add test cases for basic matrix manipulations (in-block-format dense matrix)
Add test cases for basic matrix manipulations (sparse matrix)
Rename SVD to Matrix
Add a dataset for the input tests and rename SVD to Matrix in the datasets
directory
Add input test cases for basic matrix manipulations (dense matrix both in the
array format and in the block format)
Add input test cases for basic matrix manipulations (sparse matrix)
Cleanup the datasets directory
Some changes to enable data loading

need .sql.gz file instead of .tar.gz file
Revise input test cases to reduce redundancy and avoid using skip files
Added answer files for all input tests
Improved the input tests