feat(limit-count): make rate-limit response headers configurable #957

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/http3/admin)	11m 55s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	11m 53s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	11m 54s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	11m 53s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	11m 52s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/http3/admin)	11m 53s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	11m 53s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	11m 52s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	11m 53s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	11m 54s
	1h 58m 52s

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