feat: ai-proxy plugin #16878

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	1m 22s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	1m 23s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	1m 22s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	1m 23s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	1m 23s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	1m 22s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	1m 23s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	1m 23s
	11m 1s

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