Add option to pull all metadata

Add flags to pull and fetch to grab all metadata.
Add fetch option to pull only metadata.

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

client_opts.go

@@ -195,11 +195,10 @@ func WithMaxConcurrentDownloads(max int) RemoteOpt {
 	}
 }
 
-// WithAppendDistributionSourceLabel allows fetcher to add distribute source
-// label for each blob content, which doesn't work for legacy schema1.
-func WithAppendDistributionSourceLabel() RemoteOpt {
+// WithAllMetadata downloads all manifests and known-configuration files
+func WithAllMetadata() RemoteOpt {
 	return func(_ *Client, c *RemoteContext) error {
-		c.AppendDistributionSourceLabel = true
+		c.AllMetadata = true
 		return nil
 	}
 }