stm32/adc/v3: added support for DMA based adc sampling #4583
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A lot of the code is based / copied from
ringbuffered_v2.rsI did make several changes I hope are accepted
1. V3 adc dma is not seperated to its own file to lower the amount of code duplication2. ADC dma will not halt/kill DMA on overrun, allowing the user the freedom to handle the error as they wish
3. User has access to
disable_adc, which allows to pause ADC and DMAtested on stm32l412kb6u and stm32l432kc