Rename C# files to indicate generated code (#10801)

* Change C# generation script to use .pb.cs extension

* Rename generated C# files

This was performed by running generate_protos.sh and then removing the old files.

Notes:
- This does not change the conformance test generated C# code
- This does not change the compatibility C# code
- There's currently no clean-up operation in generate_protos.sh to remove old .pb.cs files (which would now be feasible)
- The changes to TestMessagesProto2.pb.cs are just due to formatting and a new Objective-C option

* Fix well-known type source files for C# Bazel build

csharp/.gitignore

@@ -33,3 +33,8 @@ lib/protoc.exe
 
 # Benchmark output
 BenchmarkDotNet.Artifacts/
+
+# Reinstate generated code for test files
+!any_test.pb.*
+!map*unittest.pb.*
+!unittest*.pb.*

csharp/BUILD.bazel

@@ -45,17 +45,17 @@ filegroup(
 filegroup(
     name = "wkt_cs_srcs",
     srcs = [
-        "src/Google.Protobuf/Reflection/Descriptor.cs",
-        "src/Google.Protobuf/WellKnownTypes/Any.cs",
-        "src/Google.Protobuf/WellKnownTypes/Api.cs",
-        "src/Google.Protobuf/WellKnownTypes/Duration.cs",
-        "src/Google.Protobuf/WellKnownTypes/Empty.cs",
-        "src/Google.Protobuf/WellKnownTypes/FieldMask.cs",
-        "src/Google.Protobuf/WellKnownTypes/SourceContext.cs",
-        "src/Google.Protobuf/WellKnownTypes/Struct.cs",
-        "src/Google.Protobuf/WellKnownTypes/Timestamp.cs",
-        "src/Google.Protobuf/WellKnownTypes/Type.cs",
-        "src/Google.Protobuf/WellKnownTypes/Wrappers.cs",
+        "src/Google.Protobuf/Reflection/Descriptor.pb.cs",
+        "src/Google.Protobuf/WellKnownTypes/Any.pb.cs",
+        "src/Google.Protobuf/WellKnownTypes/Api.pb.cs",
+        "src/Google.Protobuf/WellKnownTypes/Duration.pb.cs",
+        "src/Google.Protobuf/WellKnownTypes/Empty.pb.cs",
+        "src/Google.Protobuf/WellKnownTypes/FieldMask.pb.cs",
+        "src/Google.Protobuf/WellKnownTypes/SourceContext.pb.cs",
+        "src/Google.Protobuf/WellKnownTypes/Struct.pb.cs",
+        "src/Google.Protobuf/WellKnownTypes/Timestamp.pb.cs",
+        "src/Google.Protobuf/WellKnownTypes/Type.pb.cs",
+        "src/Google.Protobuf/WellKnownTypes/Wrappers.pb.cs",
     ],
     visibility = ["//src/google/protobuf/compiler/csharp:__pkg__"],
 )

csharp/generate_protos.sh

@@ -32,6 +32,7 @@ fi
 # descriptor.proto and well-known types
 $PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf \
     --csharp_opt=base_namespace=Google.Protobuf \
+    --csharp_opt=file_extension=.pb.cs \
     src/google/protobuf/descriptor.proto \
     src/google/protobuf/any.proto \
     src/google/protobuf/api.proto \
@@ -52,6 +53,7 @@ $PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf \
 $PROTOC -Isrc -Icsharp/protos \
     --experimental_allow_proto3_optional \
     --csharp_out=csharp/src/Google.Protobuf.Test.TestProtos \
+    --csharp_opt=file_extension=.pb.cs \
     --descriptor_set_out=csharp/src/Google.Protobuf.Test/testprotos.pb \
     --include_source_info \
     --include_imports \
@@ -75,4 +77,5 @@ $PROTOC -Isrc -Icsharp/protos \
 
 # AddressBook sample protos
 $PROTOC -Iexamples -Isrc --csharp_out=csharp/src/AddressBook \
+    --csharp_opt=file_extension=.pb.cs \
     examples/addressbook.proto