Make a Total energy sensor that is restored after reboot

**Describe the problem you have/What new integration you would like**
There's a "Total Daily Energy" sensor that persists through reboots but it would be even more usable if there was a "Total energy" sensor that was persistant as well.

**Please describe your use case for this integration and alternatives you've tried:**
There's a Power Consumption application (https://github.com/klaasnicolaas/home-assistant-glow ) that works great but if you reboot the ESP32 the total energy number is lost but the daily is preserved. Would make sense to be able to preserve the total as well. (probably more useful than saving the daily consumption)

**Additional context**

No files, tests, or entry points are identified. Review the existing Total Daily Energy sensor and the reboot behavior described for the ESP32 application; the work is complete when a separate total-energy value is preserved across reboots without losing the existing daily sensor behavior.

Written by the indexing model from the issue text.