feat: Implement Approve and Reject Withdrawal commands with handlers

src/CMSMicroservice.Application/CommissionCQ/Commands/ApproveWithdrawal/ApproveWithdrawalCommand.cs

@@ -0,0 +1,7 @@
+namespace CMSMicroservice.Application.CommissionCQ.Commands.ApproveWithdrawal;
+
+public class ApproveWithdrawalCommand : IRequest<Unit>
+{
+    public long PayoutId { get; set; }
+    public string? Notes { get; set; }
+}