Add SDK MCP OAuth host token handlers #1399

Job	Run time
Rust SDK Tests (macos-latest)	5m 49s
Rust SDK Tests (windows-latest)	12m 17s
Rust SDK Bundled CLI Build (windows-latest)	1m 51s
Rust SDK Bundled CLI Build (macos-latest)	1m 15s
Rust SDK Bundled CLI Build (ubuntu-latest)	56s
Rust SDK Tests (ubuntu-latest)	7m 23s
	29m 31s

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