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Stm32: implement async flush for UART #3379

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Stm32: implement async flush for UART #3379

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qwerty19106
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  1. It implement non-blocking async flush for UART by enable Transmission complete interrupt.
  2. It consist fix for half-duplex: either tx or rx can be enabled one moment. The fix(stm32): disable transmitter during during half-duplex flush #3299 can be closed after merging it, because flush should get non-mutable reference. Flush should wait only, no more.

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