Add MediatR, RecActionDto, and ReadRecActionQuery

Added the `MediatR` NuGet package (v13.1.0) to enable the mediator pattern. Updated `ReC.Application.csproj` to include a project reference to `ReC.Domain`.

Introduced `RecActionDto` as a Data Transfer Object (DTO) for representing "RecAction" details, including properties for endpoints, authentication, and SQL connections.

Added `ReadRecActionQuery` to handle queries for retrieving `RecActionDto` objects, leveraging MediatR. This query filters results based on `ProfileId`.

src/ReC.Application/ReC.Application.csproj

@@ -6,4 +6,12 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="MediatR" Version="13.1.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ReC.Domain\ReC.Domain.csproj" />
+  </ItemGroup>
+
 </Project>