Fully qualify references to the io root package.

Revert this commit once scala/scala3#2860 is
merged.

Author: olafurpg

scalapb-runtime-grpc/src/main/scala/com/trueaccord/scalapb/grpc/Grpc.scala

@@ -1,8 +1,8 @@
 package com.trueaccord.scalapb.grpc
 
 import com.google.common.util.concurrent.{FutureCallback, Futures, ListenableFuture}
-import io.grpc.{Status, StatusException}
-import io.grpc.stub.StreamObserver
+import _root_.io.grpc.{Status, StatusException}
+import _root_.io.grpc.stub.StreamObserver
 
 import scala.concurrent.{Future, Promise}
 import scala.util.Try

scalapb-runtime-grpc/src/main/scala/com/trueaccord/scalapb/grpc/Marshaller.scala

@@ -4,7 +4,7 @@ import java.io.{ByteArrayInputStream, InputStream}
 
 import com.trueaccord.scalapb.{GeneratedMessage, GeneratedMessageCompanion, Message}
 
-class Marshaller[T <: GeneratedMessage with Message[T]](companion: GeneratedMessageCompanion[T]) extends io.grpc.MethodDescriptor.Marshaller[T] {
+class Marshaller[T <: GeneratedMessage with Message[T]](companion: GeneratedMessageCompanion[T]) extends _root_.io.grpc.MethodDescriptor.Marshaller[T] {
   override def stream(t: T): InputStream = new ByteArrayInputStream(t.toByteArray)
 
   override def parse(inputStream: InputStream): T =

scalapb-runtime-grpc/src/main/scala/com/trueaccord/scalapb/grpc/ProtoUtils.scala

@@ -2,7 +2,7 @@ package com.trueaccord.scalapb.grpc
 
 import com.google.protobuf.InvalidProtocolBufferException
 import com.trueaccord.scalapb.{GeneratedMessage, GeneratedMessageCompanion, Message}
-import io.grpc.Metadata
+import _root_.io.grpc.Metadata
 
 object ProtoUtils {
   class ScalaPbMetadataMarshaller[T <: GeneratedMessage with Message[T]](companion: GeneratedMessageCompanion[T]) extends Metadata.BinaryMarshaller[T] {