feat: add databaseMirroringPartner event handler

src/connection.ts

@@ -1920,6 +1920,10 @@ class Connection extends EventEmitter {
    * @private
    */
   emit(event: 'databaseChange', databaseName: string): boolean
+  /**
+   * @private
+   */
+  emit(event: 'databaseMirroringPartner', partnerInstanceName: string): boolean
   /**
    * @private
    */

src/token/handler.ts

@@ -284,6 +284,10 @@
     this.connection.emit('databaseChange', token.newValue);
   }
 
+  onDatabaseMirroringPartner(token: DatabaseMirroringPartnerEnvChangeToken) {
+    this.connection.emit('databaseMirroringPartner', token.newValue);
+  }
+
   onLanguageChange(token: LanguageEnvChangeToken) {
     this.connection.emit('languageChange', token.newValue);
   }
@@ -355,10 +359,6 @@
   onPacketSizeChange(token: PacketSizeEnvChangeToken) {
     this.connection.messageIo.packetSize(token.newValue);
   }
-
-  onDatabaseMirroringPartner(token: DatabaseMirroringPartnerEnvChangeToken) {
-    // Do nothing
-  }
 }
 
 /**