tests: use Optional and Tuple to test decorator #123

Job	Run time
Ruff	5s
Pylint	1m 39s
Typos	4s
Documentation	1m 43s
Tests for downstream project meshmode	12m 53s
Examples Conda Py3	1m 36s
Tests for downstream project grudge	10m 13s
Tests for downstream project mirgecom	3s
Mypy	1m 44s
Pytest Conda Py3 Intel	2m 19s
Pytest Conda Py3 POCL	2m 30s
Tests for downstream project mirgecom_examples	2s
	34m 51s

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