[Optimization] Deduplicate shared image/video utilities across VL processors (#6988)

* step1~3

* fix import path

* 删除重复代码

* 删除重复代码

* 删除重复代码

* fix import path

* update

* fix import path

* add unit test

* fix

* update

* fix unit test

fastdeploy/input/image_processors/__init__.py

@@ -0,0 +1,13 @@
+# Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.