Async serial write #510
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Async serial write #510
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* Initial async_{write|flush} implementations
- ESP32C3 + UART0 example
* Support UART1 & UART2
* Add examples for all chips
* reduce number of wakers depending on uart count
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This implements
embedded_hal_async::serial::WriteforUart. This is implemented through the FIFO + Interrupts.In the future (particularly for writes > FIFO size) it will be more efficient to use the DMA.