drivers: intc: add STM32WB0 GPIO interrupt controller

Adds a driver for the STM32WB0 series GPIO interrupt controller.
This driver implements the STM32 GPIO INTC API, along with an extension
function used to check if a specific line is available on current board.

This also extends the GPIO INTC API to support level-sensitive interrupts,
as this feature is available on STM32WB0.

Signed-off-by: Mathieu Choplain <mathieu.choplain@st.com>