Refactor namespaces and enhance application structure

This commit reorganizes namespaces from `DigitalData.Core.Abstractions` and `DigitalData.Core.DTO` to `DigitalData.Core.Application.Interfaces` and `DigitalData.Core.Application.DTO`, improving maintainability and clarity.

Updated using directives across multiple files to reflect the new structure, ensuring functionality remains intact.

Project references in `DigitalData.Core.API.csproj` have been consolidated to include the new Application project.

Introduced new classes and interfaces such as `BaseDTO`, `CookieConsentSettings`, `DataResult`, `Notice`, and `Result` to enhance data transfer and service result handling.

Updated `IRepository`, `ICRUDRepository`, and `IEntityMapper` interfaces to facilitate CRUD operations and entity mapping.

Added extension methods in `Extensions.cs` to improve repository usability.

New interfaces for HTTP client services have been added, enhancing external API call handling.

Overall, these changes reflect a significant restructuring aimed at improving organization and preparing for future development.

DigitalData.Core.Application/Interfaces/IReadService.cs

@@ -0,0 +1,38 @@
+using DigitalData.Core.Application.DTO;
+
+namespace DigitalData.Core.Application.Interfaces
+{
+    public interface IReadService<TReadDto, TEntity, TId>
+        where TReadDto : class where TEntity : class
+    {
+        /// <summary>
+        /// Retrieves an entity by its identifier and returns its readDTO representation wrapped in an IServiceResult,
+        /// including the readDTO on success or null and an error message on failure.
+        /// </summary>
+        /// <param name="id">The identifier of the entity to retrieve.</param>
+        /// <returns>An DataResult containing the readDTO representing the found entity or null, with an appropriate message.</returns>
+        Task<DataResult<TReadDto>> ReadByIdAsync(TId id);
+
+        /// <summary>
+        /// Retrieves all entities and returns their readDTO representations wrapped in an IServiceResult,
+        /// including a collection of readDTOs on success or an error message on failure.
+        /// </summary>
+        /// <returns>An DataResult containing a collection of readDTOs representing all entities or an error message.</returns>
+        Task<DataResult<IEnumerable<TReadDto>>> ReadAllAsync();
+        
+        /// <summary>
+        /// Deletes an entity by its identifier and returns the result wrapped in an IServiceMessage,
+        /// indicating the success or failure of the operation, including the error messages on failure.
+        /// </summary>
+        /// <param name="id">The identifier of the entity to delete.</param>
+        /// <returns>An Result indicating the outcome of the delete operation, with an appropriate message.</returns>
+        Task<Result> DeleteAsyncById(TId id);
+
+        /// <summary>
+        /// Asynchronously checks if an entity with the specified identifier exists within the data store.
+        /// </summary>
+        /// <param name="id">The identifier of the entity to check.</param>
+        /// <returns>A task that represents the asynchronous operation. The task result contains a boolean value indicating whether the entity exists.</returns>
+        Task<bool> HasEntity(TId id);
+    }
+}