Support unknown Any types in JSON serialization

[lizan]

What language does this apply to? C++

Describe the problem you are trying to solve. Having an unknown type in Any (including cases embedded Any in other message) will result MessageToJsonString fail with unknown type.

Describe the solution you'd like Have an option in JsonPrintOptions, to serialize unknown Any as {"type_url": "type.googleapis.com/FQTypeName", "value": "<base64 encoded binary serialized proto>"}, similar to what text format does.

Describe alternatives you've considered

Additional context This is useful in Envoy (https://github.com/envoyproxy/envoy) context we might have Any in logging object which is serialized by WebAssembly. Also to make sure Envoy can dump config with unknown typed config for extensions.

[elharo]

We don't want options. Serialize it always, or always don't. There is no option.

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