HIL

feat: uart configurable `tx_idle_num` #4073

Job	Run time
Build xtasks \| armv7	1m 32s
Build HIL Tests \| esp32c2	1m 36s
Build xtasks \| aarch64	1m 49s
Build HIL Tests \| esp32c3	1m 32s
Build HIL Tests \| esp32c6	1m 48s
Build HIL Tests \| esp32h2	1m 49s
Build HIL Tests \| esp32	2m 31s
Build HIL Tests \| esp32s2	2m 31s
Build HIL Tests \| esp32s3	2m 32s
Run HIL Tests \| ${{ matrix.target.soc }}	1s
	17m 41s

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