Refactored multiple files to eliminate dependencies on the
EnvelopeGenerator.CommonServices namespace. This includes
removing using directives in `ReadEmailTemplateQueryHandler.cs`,
`ReadEnvelopeResponse.cs`, and `ReadHistoryResponse.cs`.
Additionally, project references to `EnvelopeGenerator.CommonServices.vbproj`
were removed from both `EnvelopeGenerator.Application.csproj` and
`EnvelopeGenerator.Extensions.csproj`, indicating a shift towards
using only the `EnvelopeGenerator.Domain` project.
Updated ReadHistoryQuery to include a [Required] attribute for the EnvelopeId property, enforcing mandatory validation. Removed the StatusName property from ReadHistoryResponse, which may impact how status is accessed in the application.
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.
