feat(services/obs): support user defined metadata (#5405) #2144

Job	Run time
build_all_features	5m 26s
build_all_platforms (ubuntu-latest)	2m 42s
build_default_features (ubuntu-latest)	38s
build_all_platforms (macos-latest)	2m 39s
check_clippy	3m 47s
build_default_features (macos-latest)	35s
build_under_wasm	1m 1s
build_all_platforms (windows-latest)	5m 21s
build_default_features (windows-latest)	2m 17s
check_docs	3m 34s
check_msrv	30s
unit	6m 47s
	35m 17s

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