drivers: pwm: add STM32 LPTIM PWM driver #101205
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This PR introduces a PWM driver for the STM32 low-power timer (LPTIM) peripheral on STM32 MCUs.
This driver is loosely based on the PWM driver for standard timers on STM32. For maintainability and readability, I split this into a new driver instead of integrating with the existing STM PWM driver, as the supported features differ and LPTIMs use a different low-level API
LL_LPTIM_*.This PR also requires updated pin definitions from #100890.
Fixes #57316.