Inconsistent escaping of raw path strings

[neoeinstein]

Consider the following scenario:

File: test/package/v1/TestMessage.proto

syntax = "proto3";
package test.package.v1;
import "test/abstract/v1/target.proto";
message TestMessage {
    test.abstract.v1.Target target = 1;
}

File: test/abstract/v1/Target.proto

syntax = "proto3";
package test.abstract.v1;
message Target {
    bool example = 1;
}

When pbjson generates the Serialize/Deserialize impls, it will report the path to refer to Target as super::super::abstract::v1::Target. However, as abstract is a reserved keyword, this will fail to compile. The proper way to refer to this path is super::super::r#abstract::v1::Target. The prost generation correctly specifies this path.