feat: field selectors support for InformerEventSource #5245

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	2m 58s
sample_operators_tests (sample-operators/mysql-schema)	2m 30s
sample_operators_tests (sample-operators/leader-election)	3m 19s
sample_operators_tests (sample-operators/webpage)	4m 4s
	12m 51s

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