drivers: i2c: stm32 i2cv2 controller driver using rtio

Adds the simplest possible I2Cv2 controller driver for STM32 with the RTIO
interface. Currently only interrupt driven transfers are supported.

Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>
Co-authored-by: Tom Burdick <thomas.burdick@intel.com>