feat: add callback to sender

also done:

• MininmalStraightForwardTest to send a mininmal submission
• moved interfaces to own files
• removed CallbackDto
• changed Callback from record to class

contributes to planning#1096 (closed) for the .NET SDK

FitConnect/FitConnect.csproj

@@ -36,7 +36,7 @@
         <PackageReference Include="IdentityModel" Version="6.1.0" />
         <PackageReference Include="jose-jwt" Version="4.1.0" />
         <PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.2.0" />
-        <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="7.0.0" />
+        <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="7.0.1" />
         <PackageReference Include="Microsoft.IdentityModel.JsonWebTokens" Version="6.31.0" />
         <PackageReference Include="Microsoft.IdentityModel.Tokens" Version="6.31.0" />
         <PackageReference Include="MimeTypeMap.List" Version="2.1.0" />