feat: Add 'input_type' and 'max_input_length' options to OpenQuestion. #251

Job	Run time
build-test (sqlite, 3.8)	3m 15s
build-test (sqlite, 3.11)	3m 4s
build-test (mysql, 3.8)	3m 29s
build-test (mysql, 3.11)	3m 9s
trigger-publish-docs / publish-docs	25s
	13m 22s

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