RFC-5313: Remove Metakey #2025

Job	Run time
check_docs	3m 24s
build_all_features	4m 55s
build_all_platforms (ubuntu-latest)	2m 38s
build_all_platforms (macos-latest)	2m 30s
build_default_features (ubuntu-latest)	35s
build_all_platforms (windows-latest)	6m 33s
build_under_wasm	1m 29s
build_default_features (macos-latest)	41s
check_clippy	4m 24s
build_default_features (windows-latest)	1m 30s
check_msrv	32s
unit	7m 11s
	36m 22s

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