perf: accelerate the creation of the consumer cache #978

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/http3/admin)	14m 41s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	36m 39s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	36m 39s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	26m 54s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	25m 10s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/http3/admin)	16m 30s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	33m 32s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	37m 13s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	27m 6s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	28m 54s
	4h 43m 18s

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