Move runtime v2 proto

Move runtime v2 protos to api/runtime package.

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

runtime/v2/example/example.go

@@ -23,10 +23,10 @@ import (
 	"context"
 	"os"
 
+	taskAPI "github.com/containerd/containerd/api/runtime/task/v2"
 	"github.com/containerd/containerd/errdefs"
 	ptypes "github.com/containerd/containerd/protobuf/types"
 	"github.com/containerd/containerd/runtime/v2/shim"
-	taskAPI "github.com/containerd/containerd/runtime/v2/task"
 )
 
 var (