feat(earnings): add Earnings Center packets (9308-9310 / 9407-9408)

Client-side counterpart to the emulator earnings contract
(emulatore/docs/earnings-packet-contract.md). Outgoing: RequestEarningsCenter /
ClaimEarningsReward(categoryKey) / ClaimAllEarningsRewards. Incoming:
EarningsCenter + EarningsClaimResult sharing one entry/reward shape. Registered
in NitroMessages + barrel chain (incoming/outgoing/parser).

packages/communication/src/messages/incoming/earnings/EarningsCenterEvent.ts

@@ -0,0 +1,16 @@
+import { IMessageEvent } from '@nitrots/api';
+import { MessageEvent } from '@nitrots/events';
+import { EarningsCenterParser } from '../../parser';
+
+export class EarningsCenterEvent extends MessageEvent implements IMessageEvent
+{
+    constructor(callBack: Function)
+    {
+        super(callBack, EarningsCenterParser);
+    }
+
+    public getParser(): EarningsCenterParser
+    {
+        return this.parser as EarningsCenterParser;
+    }
+}

packages/communication/src/messages/incoming/earnings/EarningsClaimResultEvent.ts

@@ -0,0 +1,16 @@
+import { IMessageEvent } from '@nitrots/api';
+import { MessageEvent } from '@nitrots/events';
+import { EarningsClaimResultParser } from '../../parser';
+
+export class EarningsClaimResultEvent extends MessageEvent implements IMessageEvent
+{
+    constructor(callBack: Function)
+    {
+        super(callBack, EarningsClaimResultParser);
+    }
+
+    public getParser(): EarningsClaimResultParser
+    {
+        return this.parser as EarningsClaimResultParser;
+    }
+}

packages/communication/src/messages/incoming/earnings/index.ts

@@ -0,0 +1,2 @@
+export * from './EarningsCenterEvent';
+export * from './EarningsClaimResultEvent';