563: Initial ADC support for on STM32F1xx r=Dirbaio a=sjoerdsimons
Add an ADC implementation for F1 based chips. Primarily tested using ADC1, proper functionality for ADC2 probably needs some extra work as it's mainly a slave and can't e.g. measure vrefint by itself.
Needs https://github.com/embassy-rs/stm32-data/pull/115
Co-authored-by: Sjoerd Simons <sjoerd@collabora.com>
Co-authored-by: Dario Nieuwenhuis <dirbaio@dirbaio.net>
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