Add event for Pre-Join Dialog login/register prompts

[zkhssb]

What feature do you want to see added?

Add a Bukkit event that is fired when AuthMe shows the Pre-Join Dialog (login/register) to a player during the AsyncPlayerConnectionConfigureEvent phase.
This would allow third-party plugins to integrate with AuthMe's Pre-Join Dialog system in a cleaner way, without relying on reflection to access internal services like PreJoinDialogService.
Proposed event:

public class AuthMePreJoinDialogEvent extends Event {
    private final String playerName;
    private final UUID playerId;
    private final boolean isRegistered; // true = login, false = register
    // getters/setters
}

Use case:

Our plugin EasyBot provides QQ group login functionality. We use /authme forcelogin to authenticate players after external verification. An event would formalize this integration point.
Reference implementation:

• AuthMePreLoginDialogEvents.java
• AuthMeUtils.java

Are there any alternatives?

Current approach uses reflection to access PreJoinDialogService and /authme forcelogin command for authentication. An event would be a cleaner API.

Anything else?

Similar to how AuthMeAsyncPreLoginEvent allows plugins to intercept /login commands, a AuthMePreJoinDialogEvent would allow plugins to intercept pre-join dialog prompts.