feat(CreateHistoryCommand): add CreateHistoryCommandHandler with repository integration

- Extend CreateHistoryCommand to implement IRequest<long?>
- Introduce CreateHistoryCommandHandler to handle command via IRepository<EnvelopeHistory>
- Implement async creation and verification of EnvelopeHistory records

EnvelopeGenerator.Application/Histories/MappingProfile.cs

@@ -1,4 +1,5 @@
 using AutoMapper;
+using EnvelopeGenerator.Application.Histories.Commands;
 using EnvelopeGenerator.Application.Histories.Queries.Read;
 using EnvelopeGenerator.Domain.Entities;
 
@@ -15,5 +16,6 @@ public class MappingProfile: Profile
     public MappingProfile()
     {
         CreateMap<EnvelopeHistory, ReadHistoryResponse>();
+        CreateMap<CreateHistoryCommand, EnvelopeHistory>();
     }
 }