Normalize CallToolResult.StructuredContent to JsonElement? #2225

Job	Run time
build (ubuntu-latest, Debug)	6m 49s
build (windows-latest, Debug)	13m 27s
build (ubuntu-latest, Release)	6m 41s
build (macos-latest, Debug)	4m 53s
build (macos-latest, Release)	6m 59s
build (windows-latest, Release)	15m 38s
publish-coverage / publish-coverage	1m 5s
	55m 32s

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