Add 4-channel relay i2C from seeed

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

Can you add the board 4-channel relay i2 from seeed ? see : https://wiki.seeedstudio.com/Grove-4-Channel_SPDT_Relay/

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

**Additional context**

Start with the linked Seeed Studio Grove 4-Channel SPDT Relay documentation and inspect existing ESPHome relay and I2C integrations. Define the supported board behavior, configuration, and use case before identifying implementation files and tests; done means the integration works with the relay and is documented.

Written by the indexing model from the issue text.