Add commands to get/ set charge limit and FP brightness

[JohnAZoidberg]

The minimum limit cannot be changed.

Tested on platforms:

• Intel 12th Gen with BIOS 3.07
• AMD 13th inch with BIOS 3.04

Tested with drivers:

• portio on UEFI Shell
• portio on Linux
• cros_ec on Linux

Examples:

> framework_tool --driver portio --charge-limit
Minimum 0%, Maximum 100%

> framework_tool --charge-limit 90
Minimum 0%, Maximum 90%

> framework_tool --driver portio --fp-brightness
Fingerprint LED Brightness: 55%

> framework_tool --fp-brightness low
Fingerprint LED Brightness: 15%

Fixes #5