add WritableToStream to easily write data from linop #4526

Job	Run time
intel/icpx/release/shared	31m 23s
intel/dpcpp/release/shared	1h 25m 57s
intel/icpx/release/shared-16bit	51m 19s
intel/icpx/release/shared-bfloat16	33m 58s
	3h 22m 37s

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