remove more usings
MODIFY
WalletWasabi/EventSourcing/InMemoryEventRepository.cs
WalletWasabi/EventSourcing/InMemoryEventRepository.cs
-using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.Immutable;

MODIFY
WalletWasabi/Interfaces/EventSourcing/IEventRepository.cs
WalletWasabi/Interfaces/EventSourcing/IEventRepository.cs
-using System;
using System.Collections.Generic;
-using System.Linq;
-using System.Text;
using System.Threading.Tasks;
using WalletWasabi.EventSourcing;
using WalletWasabi.Exceptions;

remove more usings