Add ability to restore registers of I2C I/O Expanders temporary lost power

**Describe the problem you have/What new integration you would like**

If I2C I/O Expander was temporary cut of power all ports got set to input. I think we can have ability to re-initialize I/O Expander without restarting ESP to set port as required.

**Please describe your use case for this integration and alternatives you've tried:**

I2C bus initializes during boot-up once and can't be re-initialized again.

**Additional context**

I have several board with extenders connected by I2C bus. During power cut-off I wish I can keep back-up power only for ESP, but not for another boards.

Start by tracing the I2C bus initialization and the I2C I/O expander integration described in the request. Determine how an expander that temporarily loses power can be detected and reinitialized without restarting the ESP, then verify that its ports return to their required states after power is restored.

Written by the indexing model from the issue text.