Add dialpad to transfer dialog + various dialpad UI improvements (#6363)

Co-authored-by: Germain <germain@souquet.com>
Co-authored-by: Andrew Morgan <andrew@amorgan.xyz>
Co-authored-by: David Baker <dbkr@users.noreply.github.com>

src/dispatcher/actions.ts

@@ -118,6 +118,18 @@ export enum Action {
      */
     DialNumber = "dial_number",
 
+    /**
+     * Start a call transfer to a Matrix ID
+     * payload: TransferCallPayload
+     */
+    TransferCallToMatrixID = "transfer_call_to_matrix_id",
+
+    /**
+     * Start a call transfer to a phone number
+     * payload: TransferCallPayload
+     */
+     TransferCallToPhoneNumber = "transfer_call_to_phone_number",
+
     /**
      * Fired when CallHandler has checked for PSTN protocol support
      * payload: none