milo: Add barebones BuildInfo pRPC service.

milo/api/proto/buildbot.pb.go

 // Code generated by protoc-gen-go.
 // source: github.com/luci/luci-go/milo/api/proto/buildbot.proto
 // DO NOT EDIT!
 
 /*
 Package milo is a generated protocol buffer package.
 
 It is generated from these files:
         github.com/luci/luci-go/milo/api/proto/buildbot.proto
+        github.com/luci/luci-go/milo/api/proto/buildinfo.proto
 
 It has these top-level messages:
         MasterRequest
         CompressedMasterJSON
         BuildbotBuildRequest
         BuildbotBuildJSON
         BuildbotBuildsRequest
         BuildbotBuildsJSON
+        BuildInfoRequest
+        BuildInfoResponse
 */
 package milo
 
 import prpc "github.com/luci/luci-go/grpc/prpc"
 
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
 import google_protobuf "github.com/golang/protobuf/ptypes/timestamp"
 
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 }