power: supply: Add STC3117 fuel gauge unit driver

power: supply: Add STC3117 fuel gauge unit driver

Adds initial support for the STC3117 fuel gauge.

The driver provides functionality to monitor key parameters including:
Voltage, Current, State of Charge (SOC), Temperature, Status

Co-developed-by: Hardevsinh Palaniya <hardevsinh.palaniya@siliconsignals.io>
Signed-off-by: Hardevsinh Palaniya <hardevsinh.palaniya@siliconsignals.io>
Signed-off-by: Bhavin Sharma <bhavin.sharma@siliconsignals.io>
Link: https://lore.kernel.org/r/20241220084958.32367-3-bhavin.sharma@siliconsignals.io
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>