fix: add utils.go to Go components using main.go

- calculator_component, http_service_component, calculator_component_debug now include utils.go
- main.go calls TestFunction, Add, Multiply from utils.go so all components need it
- simple_test and multi_file_test already had utils.go and work
- http_service_component still fails due to missing binding dependency (separate issue)

Author: avrabe

examples/go_component/BUILD.bazel

@@ -50,6 +50,7 @@ go_wasm_component(
     srcs = [
         "calculator.go",
         "main.go",
+        "utils.go",
     ],
     adapter = "//wasm/adapters:wasi_snapshot_preview1",
     go_mod = "go.mod",
@@ -70,6 +71,7 @@ go_wasm_component(
         "handlers.go",
         "main.go",
         "service.go",
+        "utils.go",
     ],
     adapter = "//wasm/adapters:wasi_snapshot_preview1",
     go_mod = "go.mod",
@@ -83,6 +85,7 @@ go_wasm_component(
     srcs = [
         "calculator.go",
         "main.go",
+        "utils.go",
     ],
     adapter = "//wasm/adapters:wasi_snapshot_preview1",
     go_mod = "go.mod",