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The current pull=Pin.PULL_HOLD argument doesn't make a lot of sense in the context of what it actually does vs what the ESP32 quickref document says it does. This commit removes PULL_HOLD and adds a new hold=True|False keyword argument to Pin()/Pin.init(). Setting this to True will cause the ESP32 to lock the configuration of the pin – including direction, output value, drive strength, pull-up/-down – such that it can't be accidentally changed and will be retained through a watchdog or internal reset. Fixes issue #8283, and see also #8284.