Use google.protobuf.json_format for resource.dict_to_struct and resource.struct_to_dict

[negz]

What problem are you facing?

We have two helpers to convert between Python dictionaries and protobuf structs:

• resource.struct_to_dict(some_struct)
• resource.dict_to_struct(some_dict)

I believe these are equivalent to:

• google.protobuf.json_format.MessageToDict(some_struct)
• google.protobuf.json_format.ParseDict(some_dict, empty_struct)

How could this Function help solve your problem?

I think we should keep our helpers for discoverability/backward compatibility, but have them just use the json_format equivalents under the hood.

[fernandezcuesta]

Hi @negz apparently yes, see #102 which validates your statement