Introduce acceptance helpers to ElicitResult and client capability checks on IMcpServer #627

Job	Run time
build (macos-latest, Debug)	1m 47s
build (macos-latest, Release)	2m 29s
build (ubuntu-latest, Debug)	3m 0s
build (windows-latest, Release)	6m 40s
build (ubuntu-latest, Release)	3m 57s
build (windows-latest, Debug)	5m 6s
publish-coverage	0s
	22m 59s

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