Update `compile` command to support creating taproot descriptors

[notmandatory]

Currently tr script types are not supported but they are an available option in the rust-miniscript crate. The bdk-cli compile command should support them.

see:
https://docs.rs/miniscript/12.3.2/miniscript/descriptor/enum.Descriptor.html#method.new_tr

bdk-cli/src/handlers.rs

Line 725 in 7a71b14

let descriptor = match script_type.as_str() {

[va-an]

@notmandatory please assign it me, I'm working on it.