Add MediatR support for envelope history queries

Updated project references and introduced MediatR for handling
envelope history queries. Added new mapping profile and response
class, and refactored the HistoryController to utilize the
mediator pattern for improved query handling.

EnvelopeGenerator.Application/Histories/Queries/Read/ReadHistoryQueryHandler.cs

@@ -0,0 +1,44 @@
+using AutoMapper;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+using EnvelopeGenerator.Application.Exceptions;
+using MediatR;
+
+namespace EnvelopeGenerator.Application.Histories.Queries.Read;
+
+/// <summary>
+/// 
+/// </summary>
+public class ReadHistoryQueryHandler : IRequestHandler<ReadHistoryQuery, IEnumerable<ReadHistoryResponse>>
+{
+    private readonly IEnvelopeHistoryRepository _repository;
+
+    private readonly IMapper _mapper;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="repository"></param>
+    /// <param name="mapper"></param>
+    public ReadHistoryQueryHandler(IEnvelopeHistoryRepository repository, IMapper mapper)
+    {
+        _repository = repository;
+        _mapper = mapper;
+    }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="request"></param>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    /// <exception cref="NotFoundException"></exception>
+    public async Task<IEnumerable<ReadHistoryResponse>> Handle(ReadHistoryQuery request, CancellationToken cancellationToken)
+    {
+        var hists = await _repository.ReadAsync(request.EnvelopeId, status: request.Status is null ? null : (int) request.Status);
+
+        if (!hists.Any())
+            throw new NotFoundException();
+                
+        return _mapper.Map<IEnumerable<ReadHistoryResponse>>(hists);
+    }
+}