Add CallToolResult<T>, CallToolAsync<T>, and OutputSchema for tools returning CallToolResult #1968

Job	Run time
build (windows-latest, Debug)	11m 28s
build (ubuntu-latest, Release)	6m 57s
build (ubuntu-latest, Debug)	6m 48s
build (macos-latest, Debug)	7m 41s
build (windows-latest, Release)	12m 7s
build (macos-latest, Release)	5m 13s
publish-coverage / publish-coverage	1m 1s
	51m 15s

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