Function listener

listener(event, once?): ((originalMethod, context) => any)
A powerful Typescript decorator function, enabling simple, modular listeners to be built into classes.

⚠️ Requires Typescript 5 or greater.
Parameters
- event: keyof BrynjolfEvents
- once: boolean = false
Returns ((originalMethod, context) => any)
- - (originalMethod, context): any
  - Parameters
    - originalMethod: any
    - context: ClassMethodDecoratorContext<unknown, ((this, ...args) => any)>
    Returns any
Example
```
// Note: DO NOT DIRECTLY COPY THIS EXAMPLE -
// it uses fake ＠ symbols due to jsdoc limitations. 

// Reacts with 👍 on the third message received
class MessageApprover {
 private messageCount: number = 0;

 ＠listener("messageCreate")
 onMessage(message: Message) {
     this.messageCount++;
     if (this.messageCount == 3) message.react("👍");
 }
}
```
- Defined in src/decorators.ts:24

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