Make api a Go sub-module

Allow the api to stay at the same v1 go package name and keep using a
1.x version number. This indicates the API is still at 1.x and allows
sharing proto types with containerd 1.6 and 1.7 releases.

Signed-off-by: Derek McGowan <derek@mcg.dev>

plugins/services/images/helpers.go

@@ -17,8 +17,8 @@
 package images
 
 import (
-	imagesapi "github.com/containerd/containerd/v2/api/services/images/v1"
-	"github.com/containerd/containerd/v2/api/types"
+	imagesapi "github.com/containerd/containerd/api/services/images/v1"
+	"github.com/containerd/containerd/api/types"
 	"github.com/containerd/containerd/v2/core/images"
 	"github.com/containerd/containerd/v2/pkg/protobuf"
 	"github.com/opencontainers/go-digest"

plugins/services/images/local.go

@@ -24,7 +24,7 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 
-	imagesapi "github.com/containerd/containerd/v2/api/services/images/v1"
+	imagesapi "github.com/containerd/containerd/api/services/images/v1"
 	"github.com/containerd/containerd/v2/core/images"
 	"github.com/containerd/containerd/v2/core/metadata"
 	"github.com/containerd/containerd/v2/pkg/deprecation"

plugins/services/images/service.go

@@ -19,7 +19,7 @@ package images
 import (
 	"context"
 
-	imagesapi "github.com/containerd/containerd/v2/api/services/images/v1"
+	imagesapi "github.com/containerd/containerd/api/services/images/v1"
 	ptypes "github.com/containerd/containerd/v2/pkg/protobuf/types"
 	"github.com/containerd/containerd/v2/plugins"
 	"github.com/containerd/containerd/v2/plugins/services"