refactor(cmake): simplify ImGui test engine integration and feature flags

- Updated CMake configuration to always include the ImGui Test Engine when tests are enabled, removing conditional checks for UI tests.
- Simplified feature flag management by enabling JSON and gRPC by default, with a minimal build option to disable only the most expensive features.
- Enhanced status messages to provide clearer feedback on build configurations and feature availability.

Benefits:
- Streamlined integration of the ImGui Test Engine for testing purposes.
- Improved clarity in feature flag settings, making it easier to manage build configurations.

test/test_utils.h

@@ -15,11 +15,8 @@
 #include <gmock/gmock.h>
 
 #include "absl/strings/str_format.h"
-#include "app/rom.h"
-
-#ifdef YAZE_ENABLE_IMGUI_TEST_ENGINE
 #include "imgui_test_engine/imgui_te_context.h"
-#endif
+#include "app/rom.h"
 
 namespace yaze {
 namespace test {
@@ -196,10 +193,8 @@ class RomDependentTest : public ::testing::Test {
 
 namespace gui {
 
-#ifdef YAZE_ENABLE_IMGUI_TEST_ENGINE
 void LoadRomInTest(ImGuiTestContext* ctx, const std::string& rom_path);
 void OpenEditorInTest(ImGuiTestContext* ctx, const std::string& editor_name);
-#endif
 
 } // namespace gui