Serializer.GetProto does not honor System.ObsoleteAttribute

[mrshridhara]

Package version used: 3.2.30

Adding System.Obsolete attribute on class, enum or property does not result in deprecated message, enum, or property in generated proto.

C# declaration

using System;
using ProtoBuf;
using ProtoBuf.Meta;

[ProtoContract]
[Obsolete]
public class SomeClass
{
    [ProtoMember(tag: 1)]
    public int SomeProperty { get; set; }
}

[ProtoContract]
public class SomeOtherClass
{
    [ProtoMember(tag: 1)]
    [Obsolete]
    public string SomeOtherProperty { get; set; }
}

[ProtoContract]
[Obsolete]
public enum SomeEnum
{
    One,
    Two,
    Three,
}

static class Program
{
    static void Main()
    {
        var proto = Serializer.GetProto(new SchemaGenerationOptions
        {
            Syntax = ProtoSyntax.Proto3,
            Package = "DefaultPackage",
            Types = { typeof(SomeClass), typeof(SomeOtherClass), typeof(SomeEnum) },
        });

        Console.WriteLine(proto);
    }
}

Expected

syntax = "proto3";
package DefaultPackage;

message SomeClass {
   option deprecated = true;
   int32 SomeProperty = 1;
}
enum SomeEnum {
   option deprecated = true;
   One = 0;
   Two = 1;
   Three = 2;
}
message SomeOtherClass {
   string SomeOtherProperty = 1 [deprecated=true];
}

Actual

syntax = "proto3";
package DefaultPackage;

message SomeClass {
   int32 SomeProperty = 1;
}
enum SomeEnum {
   One = 0;
   Two = 1;
   Three = 2;
}
message SomeOtherClass {
   string SomeOtherProperty = 1;
}