MarshalFrom marshals src into dst as the underlying message using the provided marshal options.

New marshals src into a new Any instance.

UnmarshalNew unmarshals the underlying message from src into dst, which is newly created message using a type resolved from the type URL.

UnmarshalTo unmarshals the underlying message from src into dst using the provided unmarshal options.

ErrNotFound is returned if the message type was not found.

`Any` contains an arbitrary serialized protocol buffer message along with a URL that describes the type of the serialized message.

MessageTypeResolver is an interface for looking up messages.