feat: ai-rag plugin #702

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/http3/admin)	6m 4s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	6m 4s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	6m 6s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	6m 6s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	6m 5s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/http3/admin)	6m 2s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	6m 7s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	5m 55s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	6m 7s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	6m 8s
	1h 0m 44s

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