Updated IEnvelopeHistoryRepository and IEnvelopeHistoryService
interfaces to replace int? status with Constants.EnvelopeStatus?
status in CountAsync and ReadAsync methods. Adjusted
ReadHistoryQueryHandler and EnvelopeHistoryService methods to
accommodate the new type. Modified EnvelopeHistoryRepository
to accept Constants.EnvelopeStatus? in relevant methods and
marked it as obsolete, suggesting a future refactor.
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.