Load .tar.gz on load_models=all (#3329)

Author: m10an

frontend/server/src/main/java/org/pytorch/serve/ModelServer.java

@@ -193,7 +193,8 @@ private void initModelStore() throws InvalidSnapshotException, IOException {
                     String fileName = file.getName();
                     if (file.isFile()
                             && !fileName.endsWith(".mar")
-                            && !fileName.endsWith(".model")) {
+                            && !fileName.endsWith(".model")
+                            && !fileName.endsWith(".tar.gz")) {
                         continue;
                     }
                     try {