Added parsers for CWL input files #674

Job	Run time
CI tests via Tox (3, 8, lint)	30s
cwl-utils release test	2m 30s
CI linters via Tox (lint-readme)	21s
CI tests via Tox (3, 8, unit)	2m 41s
CI linters via Tox (pydocstyle)	19s
CI tests via Tox (3, 8, bandit)	41s
CI tests via Tox (3, 8, mypy)	1m 5s
CI tests via Tox (3, 9, lint)	37s
CI tests via Tox (3, 9, unit)	2m 9s
CI tests via Tox (3, 9, bandit)	40s
CI tests via Tox (3, 9, mypy)	1m 0s
CI tests via Tox (3, 10, lint)	31s
CI tests via Tox (3, 10, unit)	2m 26s
CI tests via Tox (3, 10, bandit)	42s
CI tests via Tox (3, 10, mypy)	53s
CI tests via Tox (3, 11, lint)	24s
CI tests via Tox (3, 11, unit)	2m 40s
CI tests via Tox (3, 11, bandit)	33s
CI tests via Tox (3, 11, mypy)	39s
CI tests via Tox (3, 12, lint)	55s
CI tests via Tox (3, 12, unit)	2m 36s
CI tests via Tox (3, 12, bandit)	56s
CI tests via Tox (3, 12, mypy)	1m 2s
	26m 50s

Provide feedback