Support protobuf representation of arr.ai values

[marcelocantos]

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Purpose

Please describe the end goal you are trying to achieve that has led you to request this feature.

In order to efficiently stream and store arr.ai values, a binary representation is useful.

Suggested approaches

What have you tried, and how might this problem be solved?

syntax = "proto3";

message Value {
    oneof which {
        Number number = 1;
        Tuple tuple = 2;
        Values set = 3;
        Values array = 4;
        string str = 5;
        bytes byt = 6;
        Relation relation = 7;
    }
}

message Number {
    oneof which {
        int64 i = 1;
        uint64 u = 2;
        float64 f = 3;
    }
}

message Tuple {
    repeated KeyValue kvs = 1;

    message KeyValue {
        Value key = 1;
        Value value = 2;
    }
}

message Values {
    repeated Value elements = 1;
}

message Relation {
    repeated string names = 1;
    repeated Values valueses = 2;
}