fix: add DbSet properties for new entities and configure relationship#4

cliedeman merged 2 commits into

mainstackworx-dotnet/Stackworx.EfCoreGraphQL:mainfrom

fix/duplicate-loader-names-and-nullable-ref-fksstackworx-dotnet/Stackworx.EfCoreGraphQL:fix/duplicate-loader-names-and-nullable-ref-fksCopy head branch name to clipboard