Implement SEP-973: Icons and metadata support for Implementations, Resources, Tools, and Prompts #803

Job	Run time
build (ubuntu-latest, Debug)	3m 34s
build (macos-latest, Debug)	3m 6s
build (macos-latest, Release)	2m 33s
build (windows-latest, Release)	7m 38s
build (windows-latest, Debug)	5m 18s
build (ubuntu-latest, Release)	3m 29s
publish-coverage / publish-coverage	36s
	26m 14s

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