[bugfix] Make ProtoCodeGenerator allow importing other proto files from the same directory

Author: platinumhamburg

fluss-protogen/fluss-protogen-generator/src/main/java/com/alibaba/fluss/protogen/generator/generator/ProtoCodeGenerator.java

@@ -35,7 +35,7 @@ public static void generate(
             List<File> inputs, File outputDirectory, String classPrefix, boolean useOuterClass)
             throws Exception {
         for (File input : inputs) {
-            Proto proto = new Proto();
+            Proto proto = new Proto(input);
             ProtoUtil.loadFrom(input, proto);
 
             String fileWithoutExtension = Splitter.on(".").splitToList(input.getName()).get(0);