Move types and plan back to main dagger package

Signed-off-by: Helder Correia <174525+helderco@users.noreply.github.com>

pkg/pkg.go

@@ -31,7 +31,8 @@ var (
 		UniverseModule,
 	}
 
-	DaggerPackage = fmt.Sprintf("%s/dagger/core", DaggerModule)
+	DaggerPackage     = fmt.Sprintf("%s/dagger", DaggerModule)
+	DaggerCorePackage = fmt.Sprintf("%s/core", DaggerPackage)
 
 	lockFilePath = "dagger.lock"
 )