perf: make fetch_secrets use cache for performance (#11201) #10

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/http3/admin)	1h 30m 1s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	29m 31s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	29m 33s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	25m 46s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	26m 27s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/http3/admin)	13m 38s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	26m 36s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	30m 39s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	22m 40s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	26m 41s
	5h 21m 32s

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