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Summary
This PR adds the Any type to the AttributeProto message as a single any_val and repeated any_list.
The Any type in Any.proto is a standard Protobuf definition included with the Protobuf installation.
The rationale behind this is that a user wants to use complex protobuf messages for metrics and configuration and add them to individual et_def.Node messages.
The any_val field in AttributeProto allows a user to easily serialize/deserialize messages into a single field while preserving the structure of the message and associated internal documentation and options.