feat(services/cos): Added user metadata support for cos service #8412

Job	Run time
build-c-doc	23s
build-java-doc	14s
build-lua-doc	14s
build-nodejs-doc	20s
build-python-doc	3m 19s
build-rust-doc	3m 37s
build-cpp-doc	26s
build-dav-server-opendalfs-doc	47s
build-fuse3-opendal-doc	41s
build-haskell-doc	2m 17s
build-object-store-opendal-doc	42s
build-ocaml-doc	4m 39s
build-opendal-compat-doc	38s
build-parquet-opendal-doc	47s
build-virtiofs-opendal-doc	41s
build-unftp-sbe-opendal-doc	1m 10s
build-website	1m 23s
	22m 18s

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