Add feature to validate map types #1752

Job	Run time
Confirm that codegen C++ passes tests with CWL	1m 10s
Schema Salad release test	11m 57s
CI tests via Tox (3, 8, lint)	26s
CI tests via Tox (3, 8, unit)	2m 54s
CI linters via Tox (lintreadme)	25s
CI tests via Tox (3, 8, mypy)	3m 11s
Confirm that codegen typescript passes tests with CWL	48s
CI linters via Tox (pydocstyle)	16s
CI tests via Tox (3, 8, memleak)	1m 35s
CI tests via Tox (3, 9, lint)	27s
CI tests via Tox (3, 9, unit)	2m 59s
build_test_container	3m 35s
CI tests via Tox (3, 9, mypy)	3m 7s
CI tests via Tox (3, 9, memleak)	1m 43s
CI tests via Tox (3, 10, lint)	35s
CI tests via Tox (3, 10, unit)	3m 5s
CI tests via Tox (3, 10, mypy)	2m 57s
CI tests via Tox (3, 10, memleak)	1m 31s
CI tests via Tox (3, 11, lint)	30s
CI tests via Tox (3, 11, unit)	2m 47s
CI tests via Tox (3, 11, mypy)	2m 46s
CI tests via Tox (3, 11, memleak)	1m 28s
CI tests via Tox (3, 12, lint)	36s
CI tests via Tox (3, 12, unit)	4m 1s
CI tests via Tox (3, 12, mypy)	3m 14s
CI tests via Tox (3, 12, memleak)	1m 37s
	59m 40s

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