feat: add latency and token_usage info in ai-proxy access log #17545

Job	Run time
build (ubuntu-latest, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	18m 26s
build (ubuntu-latest, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	34m 25s
build (ubuntu-latest, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yam...	24m 48s
build (ubuntu-latest, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script...	25m 9s
build (ubuntu-latest, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	18m 5s
build (ubuntu-latest, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	35m 6s
build (ubuntu-latest, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/con...	26m 57s
build (ubuntu-latest, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secr...	24m 27s
	3h 27m 23s

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