repository: move Blob, Blobs and PackedBlob to pack package

This removes them from the public interface. The latter now only
provides the PackBlob interface, without being bound to the type used
internally by the pack package.

internal/repository/repack.go

@@ -7,6 +7,8 @@ import (
 	"github.com/restic/restic/internal/debug"
 	"github.com/restic/restic/internal/errors"
 	"github.com/restic/restic/internal/feature"
+	"github.com/restic/restic/internal/repository/index"
+	"github.com/restic/restic/internal/repository/pack"
 	"github.com/restic/restic/internal/restic"
 	"github.com/restic/restic/internal/ui/progress"
 
@@ -80,11 +82,11 @@ func repack(
 	}
 
 	var keepMutex sync.Mutex
-	downloadQueue := make(chan restic.PackBlobs)
+	downloadQueue := make(chan index.PackBlobs)
 	wg.Go(func() error {
 		defer close(downloadQueue)
 		for pbs := range repo.listPacksFromIndex(wgCtx, packs) {
-			var packBlobs restic.Blobs
+			var packBlobs pack.Blobs
 			keepMutex.Lock()
 			// filter out unnecessary blobs
 			for _, entry := range pbs.Blobs {
@@ -96,7 +98,7 @@ func repack(
 			keepMutex.Unlock()
 
 			select {
-			case downloadQueue <- restic.PackBlobs{PackID: pbs.PackID, Blobs: packBlobs}:
+			case downloadQueue <- index.PackBlobs{PackID: pbs.PackID, Blobs: packBlobs}:
 			case <-wgCtx.Done():
 				return wgCtx.Err()
 			}