feat: Add new_wsh_sortedmulti and new_pk

[ItoroD]

Description

This Pr is based on my comment from #687 here.

Notes to the reviewers

In bdk-wallet we can do the following to create a 1 of 2 multisig descriptor. Thanks so miniscript helper functions

let multisig_descriptor = Descriptor::new_wsh_sortedmulti(1, vec![key.clone(), key2.clone()]).unwrap();

In bindings: kotlin, we do:

val multisigDescriptor = Descriptor("wsh(multi(1,$key,$key2))", Network.REGTEST)

Current we have to concatenate a string with the keys and script type to parse the descriptor.

Much easier and safer to be able to do:

val multisigDescriptor = Descriptor.newWshSortedmulti(2u, pkList);

Documentation

• new_wsh_sortedmulti - https://docs.rs/miniscript/12.3.5/miniscript/descriptor/enum.Descriptor.html#method.new_sh_wsh_sortedmulti

• new_pk - https://docs.rs/miniscript/12.3.5/miniscript/descriptor/enum.Descriptor.html#method.new_pk

• bdk_wallet

• bitcoin

• uniffi

• Other:

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• I ran cargo fmt and cargo clippy before committing
• I've added a changelog in the next release tracking issue (see example)
• I've linked the relevant upstream docs or specs above

New Features:

• I've added tests for the new feature
• I've added docs for the new feature

[reez]

this is really cool @ItoroD

[ItoroD]

this is really cool @ItoroD

Thanks!

If this get approved, I am hoping to bring in the other similar miniscript methods that take either a list of PKs or single Pk. There are other ones that take more complex params that I can focus my attention on later once these simple ones are in.

I did just these 2 in this pr just as a sort of concept and starter for the rest.