Support multipath descriptors

[notmandatory]

Describe the enhancement

The release of rust-miniscript 10.0.0 has multipath descriptor support. We should support this also in bdk 1.0 and backported to a bdk 0.2X (maintenance) release.

Use case

See bitcoin/bitcoin#17190

Additional context

This was requested by @andreasgriffin for his project bitcoin-safe.

BIP-389

[tillkolter]

Any timeline on this?

[notmandatory]

This most likely will end up in a 2.0 release some time next year.

[notmandatory]

For reference: bitcoin/bitcoin#22838

I think we may be able to add this feature in a 1.x release since we added single descriptor wallet support back in bitcoindevkit/bdk#1533.

[notmandatory]

Also requested by AnchorWatch.