Add support for si4730/5 boards

**Describe the problem you have/What new integration you would like**
Support for connecting a radio module (si4735)

**Please describe your use case for this integration and alternatives you've tried:**
There are some projects online of people connecting this board to an ESP/Arduino, controlling the signal and playing audio through a speaker. It would be nice to integrate something similar into esphome, to make these radios even smarter.
Being able to control them through HA etc. would make the possibilities limitless.

**Additional context**
Here is a link to a library for the module
https://github.com/pu2clr/SI4735
and some radios
https://create.arduino.cc/projecthub/mircemk/homemade-arduino-si4730-all-band-receiver-lw-mw-sw-fm-cbfdd6
https://www.youtube.com/watch?v=ekrlcRn1qnE&ab_channel=RicardoCaratti

Start by reviewing the linked SI4735 library and the referenced ESP/Arduino radio projects to understand the integration scope. Determine what support for SI4730/5 boards would need to expose through ESPHome and Home Assistant, and define completion around controllable radio functionality working on the target boards.

Written by the indexing model from the issue text.