feat: marking public APIs with annotations #7287

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	3m 9s
sample_operators_tests (sample-operators/mysql-schema)	3m 42s
sample_operators_tests (sample-operators/webpage)	4m 28s
sample_operators_tests (sample-operators/leader-election)	4m 2s
sample_operators_tests (sample-operators/operations)	9m 28s
	24m 49s

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