Mark all result methods in AbstractQuery as impure #200

Job	Run time
Platform test (7.4)	3m 7s
Platform test (8.0)	3m 9s
Platform test (8.1)	3m 8s
Platform test (8.2)	3m 16s
Platform test (8.3)	3m 4s
Platform test (8.4)	3m 22s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	3m 8s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 56s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	3m 15s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 33s
	30m 58s

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