API to read weights from ckpt file

System information

• TensorFlow version (you are using): Nightly
• Are you willing to contribute it (Yes/No): No

Describe the feature and the current behavior/state.
This API would help in reading the weights from ckpt file. Currently, there is no such feature in the Java SDK but the same can be achieved in python via CheckPointReader.

Will this change the current API? How?
This shouldn't affect the preexisting API. It would be a simple addition over it.

Who will benefit with this feature?
I was developing a Federated Learning Application and was stuck at the issue where I was not able to get the weights from the ckpt file (Reason: No API in Java SDK) and neither could I write a signature method in tflite for the same (Reason: tflite doesn't support dynamic tensor shapes). So this would help promote active development in FL on Android clients.

首先将请求的 Java SDK 能力与 Python 的 CheckPointReader 进行比较，并审查 TensorFlow 检查点权重如何为 Java 和 Android 客户端表示。完成的标准是添加一个能够从 ckpt 文件读取权重的 Java API，同时不改变现有 API，并且其行为适用于联邦学习用例。