Singlesig descriptor: add taproot support

[ok300]

The descriptor currently supports only WPKH and SHWPKH:

lwk/lwk_common/src/descriptor.rs

Lines 19 to 22 in 0924022

	let (prefix, path, suffix) = match script_variant {
	Singlesig::Wpkh => ("elwpkh", format!("84h/{coin_type}h/0h"), ""),
	Singlesig::ShWpkh => ("elsh(wpkh", format!("49h/{coin_type}h/0h"), ")"),
	};

Please add support for the taproot variant.

[LeoComandini]

Hi @ok300,

We are going to add support for it,
but it will require a bit of time since we also want to add spending capabilities from such descriptor.

Why do you need that? Can you share more details on your use case? Do you just want to use a taproot singlesig wallet?

[ok300]

Hey @LeoComandini , thanks for the follow-up 🙏

Yes the main use-case is a singlesig taproot wallet.

It's more of an enhancement request, so it's completely fine if it takes some time.