ts0601_energy_meter quirk for Tuya power meter devices

Aims to address device support requests:

2 bidirectional clamps:
zigpy#2549 (_TZE204_81yrt3lo)
zigpy#2650 (_TZE200_rks0sgb7)

1 bidirectional clamp:
zigpy#2420 (_TZE204_ac0fhfiq)

1 clamp:
zigpy#1973 (_TZE204_cjbofhxw)

@jmuf I've just spotted that in parallel you've also been working on zigpy#2870 for 
_TZE200_rks0sgb7, shall we pool ideas?