Refactor repositories and enhance documentation

- Mark `IEmailTemplateRepository` and `_repository` in `ReadEmailTemplateQueryHandler` as obsolete, suggesting the use of `IRepository`.
- Update `ResetEmailTemplateCommand` with additional documentation and examples for `Type`.
- Change return type of `CreateEnvelopeReceiverCommand` to `IRequest<CreateEnvelopeReceiverResponse>`.
- Improve caching methods in `CacheExtensions.cs` for better functionality and clarity.
- Add XML documentation to the `Ok` method in `MappingExtensions`.
- Make `UserReference` property required in `ReadHistoryResponse`.

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

@@ -10,6 +10,7 @@ namespace EnvelopeGenerator.Application.Histories.Queries.Read;
 /// </summary>
 public class ReadHistoryQueryHandler : IRequestHandler<ReadHistoryQuery, IEnumerable<ReadHistoryResponse>>
 {
+    [Obsolete("Use IRepository")]
     private readonly IEnvelopeHistoryRepository _repository;
 
     private readonly IMapper _mapper;
@@ -19,6 +20,7 @@ public class ReadHistoryQueryHandler : IRequestHandler<ReadHistoryQuery, IEnumer
     /// </summary>
     /// <param name="repository"></param>
     /// <param name="mapper"></param>
+    [Obsolete("Use IRepository")]
     public ReadHistoryQueryHandler(IEnvelopeHistoryRepository repository, IMapper mapper)
     {
         _repository = repository;
@@ -41,4 +43,4 @@ public class ReadHistoryQueryHandler : IRequestHandler<ReadHistoryQuery, IEnumer
                 
         return _mapper.Map<IEnumerable<ReadHistoryResponse>>(hists);
     }
-}
+}

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

@@ -20,7 +20,7 @@ public class ReadHistoryResponse
     /// <summary>
     /// Gets or sets the reference identifier of the user who performed the action.
     /// </summary>
-    public string UserReference { get; set; }
+    public required string UserReference { get; set; }
 
     /// <summary>
     /// Gets or sets the status code of the envelope.