Make parsers inherit from `schema_salad.metaschema` #1323

Job	Run time
CI linters via Tox (pydocstyle)	16s
cwl-utils release test	4m 12s
CI linters via Tox (lint-readme)	22s
CI tests via Tox (3, 11, unit)	2m 0s
CI tests via Tox (3, 10, mypy)	1m 4s
CI tests via Tox (3, 11, lint)	27s
CI tests via Tox (3, 12, lint)	45s
CI tests via Tox (3, 10, lint)	30s
CI tests via Tox (3, 10, bandit)	34s
CI tests via Tox (3, 12, bandit)	30s
CI tests via Tox (3, 10, unit)	2m 8s
CI tests via Tox (3, 12, unit)	2m 2s
CI tests via Tox (3, 11, bandit)	32s
CI tests via Tox (3, 13, mypy)	1m 5s
CI tests via Tox (3, 14, lint)	23s
CI tests via Tox (3, 13, unit)	2m 2s
CI tests via Tox (3, 14, unit)	2m 11s
CI tests via Tox (3, 14, bandit)	32s
CI tests via Tox (3, 13, lint)	32s
CI tests via Tox (3, 14, mypy)	55s
CI tests via Tox (3, 13, bandit)	34s
CI tests via Tox (3, 11, mypy)	49s
CI tests via Tox (3, 12, mypy)	59s
	25m 24s

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