Add compiler to pbjson_types

The google protobuf Well-Known types from the [compiler module](https://docs.rs/prost-types/latest/prost_types/compiler/index.html) module in `prost_types` are missing in `pbjson_types` afaict, can those be added? Thanks.

Compare the google protobuf Well-Known types in the prost_types compiler module with the types currently exposed by pbjson_types. Inspect how pbjson_types is generated, then add the missing compiler types and verify that all compiler-module types receive serde implementations.

Written by the indexing model from the issue text.