Added 4-lead multi calibration.

src/client.rs

@@ -76,10 +76,11 @@ impl WorkbookClient {
 
     pub async fn start_impedancemeter_multi(
         &self,
+        lead_mode: BioImpedanceLeadMode,
         points: MeasurementPointSet,
     ) -> Result<MultiImpedanceInitResult, WorkbookError<Infallible>> {
         let response = self.client
-            .send_resp::<StartMultiImpedanceEndpoint>(&MultiImpedanceStartRequest { points })
+            .send_resp::<StartMultiImpedanceEndpoint>(&MultiImpedanceStartRequest { lead_mode, points })
             .await?;
         Ok(response)
     }