Add support for iNode Energy Meter - opto

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

Please add support for iNode Energy Meter - https://inode.pl/iNode-Energy-Meter-opto,p,27
It was already added to openmqttgateway: https://github.com/1technophile/OpenMQTTGateway/commit/caad5dde1a7a01c975329ad622c771e61baf69d1, more docs can be obtained on vendor support site:
https://support.elsat.com.pl/
login:inode
password; empty

**Please describe your use case for this integration and alternatives you've tried:**
I want to obtain energy usage data from electricity meter to monitor it in homeassistant.

**Additional context**

Start with the linked OpenMQTTGateway commit and the iNode vendor documentation at support.elsat.com.pl to determine the meter's protocol, data format, and required transport. Compare that implementation with the repository's existing integration structure; done means ESPHome can obtain the meter's energy usage data for Home Assistant, with appropriate validation and tests.

Written by the indexing model from the issue text.