feat: body-transformer plugin for other data formats without warnings #12529

Job	Run time
run ci on centos7 (lua-resty-worker-events, t/plugin/[a-k]*)	30m 28s
run ci on centos7 (lua-resty-worker-events, t/plugin/[l-z]*)	30m 19s
run ci on centos7 (lua-resty-worker-events, t/admin t/cli t/config-center-yaml t/control t/core t...	22m 43s
run ci on centos7 (lua-resty-worker-events, t/node t/pubsub t/router t/script t/secret t/stream-n...	21m 14s
run ci on centos7 (lua-resty-events, t/plugin/[a-k]*)	30m 31s
run ci on centos7 (lua-resty-events, t/plugin/[l-z]*)	30m 13s
run ci on centos7 (lua-resty-events, t/admin t/cli t/config-center-yaml t/control t/core t/debug ...	22m 34s
run ci on centos7 (lua-resty-events, t/node t/pubsub t/router t/script t/secret t/stream-node t/u...	21m 33s
	3h 29m 35s

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