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/ReadHistoryMappingProfile.cs

@@ -0,0 +1,18 @@
+using AutoMapper;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Histories.Queries.Read;
+
+/// <summary>
+/// 
+/// </summary>
+public class ReadHistoryMappingProfile: Profile
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public ReadHistoryMappingProfile()
+    {
+        CreateMap<EnvelopeHistory, ReadHistoryMappingProfile>();
+    }
+}