Add `default.tensor` to `setup.py` #126

Job	Run time
Determine runner type to use / determine_workflow_runner	1s
Python tests (lightning_qubit, OFF)	2m 41s
Python tests (lightning_qubit, ON)	2m 48s
Python tests (lightning_qubit, OFF, 1)	15m 37s
Python tests (lightning_qubit, OFF, 2)	16m 26s
Python tests (lightning_qubit, OFF, 3)	14m 50s
Python tests (lightning_qubit, OFF, 4)	13m 16s
Python tests (lightning_qubit, ON, 1)	15m 55s
Python tests (lightning_qubit, ON, 2)	16m 8s
Python tests (lightning_qubit, ON, 3)	14m 59s
Python tests (lightning_qubit, ON, 4)	13m 34s
Upload python coverage data to codecov	10s
	2h 6m 25s

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