Add getPairingId

src/client.ts

@@ -228,7 +228,16 @@ export class SDKSignerClient {
       this.on('message', handler);
     });
   }
-  async get_owned_processes(): Promise<ServerResponse> {
+
+  async getPairingId(): Promise<ServerResponse> {
+    const message: ClientMessage = {
+      type: MessageType.GET_PAIRING_ID,
+      messageId: this.generateMessageId()
+    };
+    return this.sendAndWait(message, MessageType.GET_PAIRING_ID);
+  }
+
+  async getOwnedProcesses(): Promise<ServerResponse> {
     const message: ClientMessage = {
       type: MessageType.GET_MY_PROCESSES,
       messageId: this.generateMessageId()