feat(communication): housekeeping economy — 4 composers

OutgoingHeader 9117-9120: give-credits, give-currency (generic across
duckets/diamonds/seasonal via a currencyType int), grant-item,
set-hc-subscription. All four ride the existing
HousekeepingActionResultEvent — no new parser needed.

`yarn compile:fast` clean.

packages/communication/src/messages/outgoing/housekeeping/HousekeepingGrantItemComposer.ts

@@ -0,0 +1,11 @@
+import { IMessageComposer } from '@nitrots/api';
+
+export class HousekeepingGrantItemComposer implements IMessageComposer<ConstructorParameters<typeof HousekeepingGrantItemComposer>>
+{
+    private _data: ConstructorParameters<typeof HousekeepingGrantItemComposer>;
+
+    constructor(userId: number, itemId: number, quantity: number) { this._data = [userId, itemId, quantity]; }
+
+    public getMessageArray() { return this._data; }
+    public dispose(): void { return; }
+}