[SYSTEMDS-2811] Compressed slice

[Baunsgaard]

This PR contains an addition to slice compressed, that allows the slices not to decompress the entire matrix, but only the sliced parts. The implementation handle the following cases:

• single value slice, is replaced by a getValue() that is placed into a new matrix output.
• Row slices, that only decompress the rows selected
• Column slices, that maintain compressed outputs.
• Selective row/col slices that leverage first the column slice followed by a decompressing row slice.

A further improvement would be to maintain compression if the Row slice is large enough to do so. But this would require further work.