"Battery Drain Detective"

[tswistak]

Before submitting

• I've checked existing issues and haven't found any that already cover this feature request.
• This issue contains only one feature request.
• The title is only a short summary, and the full details are written in the description below.
• The issue title and description are written in English.

Feature description

Find and show the user in a clean way abnormal battery drain and what caused it, based on logs. Either autodetect and automatically show those (e.g. via notification) or let the user select a time period for investigation.

• Use data collected for Screen time and per-app usage #4, Discharging session stats #118, Temperature stats #120, and Deep battery diagnostics #121.
• Try to find correlations between them.
• Find abnormalities that could cause the drain.
• No AI needed. Rather, try to think of deterministic scoring using traditional statistical methods.

For example, a sample result:

Abnormal battery drain: 01:35 AM - 01:57 AM
Cause: 
- Phone didn't enter sleep mode.
- `com.scam.app` had partial wakelock for 22 minutes.