[protobuf] How to get a field object using name in proto3 like MutableExtension

[Mihir Thakkar]

Hello everyone,

Intro: My company is in the process of migrating schemas from proto2 to 
proto3. I am eliminating extensions as they are not supported. 

Question: I am wondering if it is possible to get a field object using it's 
name.

Example: In proto2, my current code looks like this:

*> Foo.proto*
message Foo {
    message Bar {
        unint32 a = 1;
    }
    extend Foo {
        Bar b = 1;
    }
}

*> in C++*
*Foo::Bar b_val = foo.MutableExtension(Foo::b);*

Now in proto3, I could do this:

*> Foo.proto*
syntax="proto3";
message Foo {
    message Bar {
        unint32 a = 1;
    }
    Bar b = 1;
}

*> in C++*
*Foo::Bar b_val = foo.mutable_b();*

However, I want to use the name Foo::b to get a Foo::Bar object. Is there a 
way to do this? If there is, which one is recommended?

Thanks,
Mihir

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