feat(services/cos): Added user metadata support for cos service #2352

Job	Run time
build_all_features	5m 0s
build_all_platforms (ubuntu-latest)	2m 48s
build_default_features (ubuntu-latest)	43s
build_all_platforms (macos-latest)	3m 24s
build_under_wasm	59s
build_default_features (macos-latest)	49s
build_all_platforms (windows-latest)	5m 45s
build_default_features (windows-latest)	2m 7s
check_clippy	3m 35s
check_docs	3m 19s
check_msrv	43s
unit	7m 0s
	36m 12s

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