Fix support for `enumType` on array fields #101

Job	Run time
Platform test (7.4)	3m 45s
Platform test (8.0)	3m 19s
Platform test (8.1)	3m 46s
Platform test (8.2)	3m 24s
Platform test (8.3)	2m 58s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	3m 17s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 41s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 45s
	25m 55s

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