Merge #1037

1037: Add uart async task example r=miathedev a=miathedev

Dear Embassy Team,

here i propose an additional async uart pass-through example for the STM32WL.


Because im quite new to Rust, is there something like **interfaces**?

The code: 
```
mut usart1: Uart<
    'static,
    embassy_stm32::peripherals::USART1,
    embassy_stm32::peripherals::DMA1_CH3,
    embassy_stm32::peripherals::DMA1_CH4,
>,
mut usart2: Uart<
    'static,
    embassy_stm32::peripherals::LPUART1,
    embassy_stm32::peripherals::DMA1_CH5,
    embassy_stm32::peripherals::DMA1_CH6,
>,
```
is quite ugly in my opinion. I would like to allow any Type of DMA and USART/UART as argument. Is this possible somehow?
Im open to any feedback.

With love,
Mia

Co-authored-by: miathedev <[email protected]>

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