Mark all result methods in AbstractQuery as impure #196

Job	Run time
Platform test (7.4)	3m 13s
Platform test (8.0)	3m 10s
Platform test (8.1)	3m 3s
Platform test (8.2)	3m 28s
Platform test (8.3)	3m 9s
Platform test (8.4)	3m 3s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 47s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 39s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 34s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 25s
	29m 31s

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