Drop "Atomic" types in favor of recursive typedefs #1897

Job	Run time
Tox (3, 8, lint)	27s
Tox (3, 8, unit)	6m 41s
No leftovers	4m 8s
Tox (3, 8, bandit)	37s
CWL conformance (v1.0, docker)	4m 3s
Tox (3, 8, mypy)	7m 24s
CWL conformance (v1.0, singularity)	3m 55s
Tox (3, 9, lint)	31s
CWL conformance (v1.0, podman)	4m 16s
CWL conformance (v1.1, docker)	5m 56s
Tox (3, 9, unit)	6m 9s
CWL conformance (v1.1, singularity)	7m 5s
Linters (lintreadme)	47s
Tox (3, 9, bandit)	31s
CWL conformance (v1.1, podman)	6m 10s
Linters (shellcheck)	25s
Tox (3, 9, mypy)	8m 13s
CWL conformance (v1.2, docker)	7m 47s
Linters (pydocstyle)	19s
Tox (3, 10, lint)	44s
CWL conformance (v1.2, singularity)	8m 28s
Tox (3, 10, unit)	6m 7s
CWL conformance (v1.2, podman)	7m 58s
Tox (3, 10, bandit)	30s
CWL conformance (v1.2, docker, --fast-parser)	7m 44s
Tox (3, 10, mypy)	7m 31s
build_test_container	9m 5s
Tox (3, 11, lint)	28s
Tox (3, 11, unit)	8m 17s
Tox (3, 11, bandit)	27s
Test on macos-latest	5m 59s
Tox (3, 11, mypy)	6m 48s
cwltool release test	16m 30s
Tox (3, 12, lint)	47s
Tox (3, 12, unit)	13m 22s
Tox (3, 12, bandit)	27s
Tox (3, 12, mypy)	7m 33s
	3h 4m 9s

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