Add Alliance Extension Handling (#3903)

## Description:

Allows the Alliance hotkey to extend an alliance as expected by
https://discord.com/channels/1284581928254701718/1503351192921571409
 

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

babyboucher

src/client/ClientGameRunner.ts

@@ -47,6 +47,7 @@ import {
 import { endGame, startGame, startTime } from "./LocalPersistantStats";
 import { terrainMapFileLoader } from "./TerrainMapFileLoader";
 import {
+  SendAllianceExtensionIntentEvent,
   SendAllianceRequestIntentEvent,
   SendAttackIntentEvent,
   SendBoatAttackIntentEvent,
@@ -851,6 +852,8 @@ export class ClientGameRunner {
         this.eventBus.emit(
           new SendAllianceRequestIntentEvent(myPlayer, recipient),
         );
+      } else if (actions.interaction?.allianceInfo?.canExtend) {
+        this.eventBus.emit(new SendAllianceExtensionIntentEvent(recipient));
       }
     });
   }