Remove DispatchR and use Mediator

Application/Tracks/Queries/GetTrackByIdQuery.cs

@@ -1,9 +1,9 @@
 using Ardalis.Result;
-using DispatchR.Abstractions.Send;
+using Mediator;
 using Musify.Application.Tracks.Responses;
 
 namespace Musify.Application.Tracks.Queries
 {
     public record GetTrackByIdQuery(Guid TrackId)
-        : IRequest<GetTrackByIdQuery, Task<Result<TrackResponse> >>;
+        : IQuery<Result<TrackResponse>>;
 }

Application/Tracks/Queries/GetTracksByUserIdQuery.cs

@@ -1,5 +1,5 @@
 using Ardalis.Result;
-using DispatchR.Abstractions.Send;
+using Mediator;
 using Musify.Application.Contracts.Application;
 using Musify.Application.Tracks.Responses;
 
@@ -10,5 +10,5 @@ namespace Musify.Application.Tracks.Queries
         string Name = "",
         int PageNumber = 1,
         int PageSize = 10)
-        : IRequest<GetTracksByUserIdQuery, Task<Result<PaginatedResponse<TrackResponse> > >>;
+        : IQuery<Result<PaginatedResponse<TrackResponse> > >;
 }

Application/Tracks/Queries/GetTracksQuery.cs

@@ -1,10 +1,10 @@
 using Ardalis.Result;
-using DispatchR.Abstractions.Send;
+using Mediator;
 using Musify.Application.Contracts.Application;
 using Musify.Application.Tracks.Responses;
 
 namespace Musify.Application.Tracks.Queries
 {
     public record GetTracksQuery(int PageNumber = 1, int PageSize = 10)
-        : IRequest<GetTracksQuery, Task<Result<PaginatedResponse<TrackResponse> >> >;
+        : IQuery<Result<PaginatedResponse<TrackResponse> >>;
 }