feat: rewrite hmac-auth plugin for usability #693

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/http3/admin)	14m 8s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	34m 13s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	35m 31s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	26m 24s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	25m 1s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/http3/admin)	15m 53s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	33m 38s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	33m 20s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	27m 31s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	26m 54s
	4h 32m 33s

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