refactor: remove dead code and de-duplicate service boilerplate

internal/codegen/generator.go

@@ -18,10 +18,7 @@ func (g *Generator) GenerateAll(model *SmithyModel, outputDir string, scaffoldDi
 
 	generators := map[string]func(string, *SmithyModel) (string, error){
 		"types.go":         g.GenerateTypes,
-		"interface.go":     g.GenerateInterface,
 		"base_provider.go": g.GenerateBaseProvider,
-		"serializer.go":    g.GenerateSerializer,
-		"deserializer.go":  g.GenerateDeserializer,
 		"router.go":        g.GenerateRouter,
 		"errors.go":        g.GenerateErrors,
 	}
@@ -46,7 +43,6 @@ func (g *Generator) GenerateAll(model *SmithyModel, outputDir string, scaffoldDi
 
 		scaffolds := map[string]func(string, *SmithyModel) (string, error){
 			"provider.go": g.GenerateScaffold,
-			"register.go": g.GenerateRegister,
 		}
 
 		for fileName, genFunc := range scaffolds {

internal/codegen/generator_test.go

@@ -21,8 +21,7 @@ func TestGenerateAll(t *testing.T) {
 
 	serviceDir := filepath.Join(outDir, "s3")
 	files := []string{
-		"types.go", "interface.go", "base_provider.go",
-		"serializer.go", "deserializer.go", "router.go", "errors.go",
+		"types.go", "base_provider.go", "router.go", "errors.go",
 	}
 	for _, f := range files {
 		path := filepath.Join(serviceDir, f)