feat: expose clientName in SDK session metadata #701

Job	Run time
Rust SDK Bundled CLI Build (macos-latest)	51s
Rust SDK Bundled CLI Build (ubuntu-latest)	51s
Rust SDK Tests (macos-latest)	2m 7s
Rust SDK Bundled CLI Build (windows-latest)	1m 25s
Rust SDK Tests (windows-latest)	3m 55s
Rust SDK Tests (ubuntu-latest)	1m 27s
	10m 36s

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