add test for client middleware options

[paulwe]

eg

=== RUN   TestMiddleware/common_middleware_propagate_client_request_args/WithClientObservability
    /Users/paul/projects/protocol/rpc/typed_api_test.go:61: 
        	Error Trace:	/Users/paul/projects/protocol/rpc/typed_api_test.go:61
        	Error:      	Should be true
        	Test:       	TestMiddleware/common_middleware_propagate_client_request_args/WithClientObservability
        	Messages:   	failed to receive option 0 from /Users/paul/projects/psrpc/pkg/middleware/otelpsrpc/otel.go:46 github.com/livekit/psrpc/pkg/middleware/otelpsrpc.ClientOptions.func1

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