Enable Editions in the C# generator.

PiperOrigin-RevId: 611508658

src/google/protobuf/compiler/csharp/csharp_generator.cc

@@ -28,7 +28,8 @@ Generator::Generator() {}
 Generator::~Generator() {}
 
 uint64_t Generator::GetSupportedFeatures() const {
-  return CodeGenerator::Feature::FEATURE_PROTO3_OPTIONAL;
+  return CodeGenerator::Feature::FEATURE_PROTO3_OPTIONAL |
+         CodeGenerator::Feature::FEATURE_SUPPORTS_EDITIONS;
 }
 
 void GenerateFile(const FileDescriptor* file, io::Printer* printer,

src/google/protobuf/compiler/csharp/csharp_generator.h

@@ -35,6 +35,8 @@ class PROTOC_EXPORT Generator : public CodeGenerator {
     GeneratorContext* generator_context,
     std::string* error) const override;
   uint64_t GetSupportedFeatures() const override;
+  Edition GetMinimumEdition() const override { return Edition::EDITION_PROTO2; }
+  Edition GetMaximumEdition() const override { return Edition::EDITION_2023; }
   using CodeGenerator::GetEdition;
 };