Chlorinator improvements

Great work on this integration cryptk!

It would be really helpful to make these improvements when you get time:

1. Add sensor values for chlorinator:
- Cell Temp
- Cell Current
- Cell Voltage
- Relay Polarity
- Status: On/off/chlorinating

2. Add slider for ORP set point

Here's a link to diagnostics: https://www.dropbox.com/scl/fi/1bnvancem5bu6f03u2g41/config_entry-omnilogic_local-01JJHF78M8Q59J80Z10SJNDB34.json?rlkey=8xipermdr9sdx3jejxh029u4n&dl=0

Thanks,
Matt

Start by reading the integration's existing chlorinator handling and the linked diagnostics JSON to identify available values and the current ORP setpoint control. Done means exposing Cell Temp, Cell Current, Cell Voltage, Relay Polarity, and chlorinator status, plus an ORP setpoint slider, with the requested values represented correctly.

Written by the indexing model from the issue text.