feat: add databaseMirroringPartner event handler (#1671)

* added databaseMirroringPartner event emitter

* added onDatabaseMirroringPartner handler methods

* removed unnecessary database mirroring event handlers

* re-added database mirroring handler for login7tokenhandler

* removed database mirroring partner event from generic request token handler

Author: nick-w-nick

src/connection.ts

@@ -1921,6 +1921,10 @@ 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 @@ export class Login7TokenHandler extends TokenHandler {
     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 @@ export class Login7TokenHandler extends TokenHandler {
   onPacketSizeChange(token: PacketSizeEnvChangeToken) {
     this.connection.messageIo.packetSize(token.newValue);
   }
-
-  onDatabaseMirroringPartner(token: DatabaseMirroringPartnerEnvChangeToken) {
-    // Do nothing
-  }
 }
 
 /**