Support displaying Taproot addresses on Coldcard Edge (6+) firmware

[craigraw]

Coldcard's Edge (6+) firmware includes support for Taproot keyspends. Signing singlesig Taproot transactions is already possible using HWI 2.3.1.

However, an error is returned when displaying Taproot addresses:

HWI/hwilib/devices/coldcard.py

Lines 246 to 247 in c3a94b6

	elif addr_type == AddressType.TAP:
	raise UnavailableActionError("Coldcard does not support displaying Taproot addresses yet")

Also noting this function, used when retrieving a descriptor:

HWI/hwilib/devices/coldcard.py

Lines 393 to 399 in c3a94b6

	def can_sign_taproot(self) -> bool:
	"""
	The Coldard does not support Taproot yet.
	:returns: False, always
	"""
	return False