Add async SQL execution methods to DbRepository

Added `ExecuteSqlRawAsync` and `ExecuteSqlInterpolatedAsync` methods to the `DbRepository` class for asynchronous SQL execution. Updated the `System.Linq` namespace import to support LINQ operations. Simplified conditional compilation directives by consistently enclosing the class declaration in braces `{}` across frameworks. Adjusted closing braces to align with the updated structure.

DigitalData.Core.Infrastructure/DbRepository.cs

@@ -13,12 +13,7 @@ using System.Threading.Tasks;
 #endif
 
 namespace DigitalData.Core.Infrastructure
-#if NET
+{
-    ;
-#elif NETFRAMEWORK
-    {
-#endif
-
     public class DbRepository<TDbContext> where TDbContext : DbContext
     {
         protected internal readonly TDbContext Context;
@@ -28,6 +23,16 @@ namespace DigitalData.Core.Infrastructure
             Context = context;
         }
 
+        public Task<int> ExecuteSqlRawAsync([NotParameterized] string sql, IEnumerable<object> parameters, CancellationToken cancel = default)
+        {
+            return Context.Database.ExecuteSqlRawAsync(sql, parameters, cancel);
+        }
+
+        public Task<int> ExecuteSqlInterpolatedAsync(FormattableString sql, CancellationToken cancel = default)
+        {
+            return Context.Database.ExecuteSqlInterpolatedAsync(sql, cancel);
+        }
+
         public int ExecuteSqlRaw([NotParameterized] string sql, params object[] parameters)
         {
             return Context.Database.ExecuteSqlRaw(sql, parameters);
@@ -155,6 +160,4 @@ namespace DigitalData.Core.Infrastructure
         public virtual IQueryable<TEntity> ReadOnly() => Entities.AsNoTracking();
         #endregion
     }
-#if NETFRAMEWORK
+}
-    }
-#endif