Adds protobuf serialization to Tree models #278
Merged
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Description
Adds protobuf serialization to Tribuo's tree models. Unlike the other protobuf models this requires some complex logic to linearise the tree rather than arbitrarily nesting the protobufs. This is because in the future we will want to store the tree linearly anyway as it's much more cache efficient, and so having the storage format line up with that will make the internal transformation much simpler.
Motivation
We need to move off Java serialization.