docs: add page to describe cache access model #5630

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	2m 52s
sample_operators_tests (sample-operators/leader-election)	3m 46s
sample_operators_tests (sample-operators/tomcat-operator)	3m 25s
sample_operators_tests (sample-operators/webpage)	3m 13s
	13m 16s

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