[CLIENT-3106] Refactor policy code (complete refactor) #3686

Job	Run time
generate-coverage-report	42s
check-links-docs	23s
build (3.8)	59s
build (3.9)	58s
lint	21s
spellcheck-docs	33s
build (3.10)	56s
build (3.11)	55s
build (3.12)	53s
coverage-upload	20s
test-ce-latest-release	0s
stubtest	0s
test-ce	0s
test-ee	0s
test-lowest-supported-server	0s
test-metrics-cluster-name	0s
test-metrics-node-close-listener	0s
	7m 0s

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