Revise the Code Flashing Binaries to Target (RDT-576)

[hfudev]

For now we're calling internal esptool functions while flash. Research if we could

1. get target

   esp: esptool.ESPLoader = esptool.get_default_connected_device(
       ports,
       port=port,
       connect_attempts=3,
       initial_baud=baud,
       chip=esptool_target,
   )

2. call esptool.main(*args, esp=esp) to use esptool cli functions

Besides, the subprocess call of esptool existing elsewhere could also be replaced by esptool.main