feat: add STM32U0xx support

[fpistm]

This PR add the support of the STM32U0 series.

• From STM32CubeU0 v1.1.0
  • Add HAL from version 1.1.0
  • Add CMSIS from version 1.0.0

Tests using a Nucleo-U083RC:

• [x] GPIO
• [x] ADC
• [x] ADC internal (see https://github.com/stm32duino/STM32Examples/pull/59)
• [x] HardwareTimer (PWM)
• [x] EXTI
• [x] I2C (EEPROM RW, I2C scanner) I2C4 not functionnal.
• [x] SPI (SD, TFT)
• [x] EEPROM emulation
• [x] Serial
• [x] RTC --> requires https://github.com/stm32duino/STM32RTC/pull/111
• [ ] LowPower
• [x] IWDG
• [x] USB Device (CDC/HID)
• [ ] FreeRTOS
• [x] CMSIS DSP

Fixes #2491