Support NIP-44 encryption for NWC

[ekzyis]

Describe the problem you're trying to solve

NWC wallets will add versioning and switch to NIP-44 encryption at some point, see nostr-protocol/nips#1531.

We are about to switch to NDK (#1590), but it doesn't seem to support NIP-44 for NWC specifically yet. However, the NDKPrivateSigner has NIP-44 encryption support.

Describe the solution you'd like

What's needed is to detect which encryption scheme the wallet supports (nip04 or nip44) as specified in nostr-protocol/nips#1531 and then encrypt requests with the corresponding scheme.

Describe alternatives you've considered

n/a

Additional context

There is some work currently being done in NDK regarding migration to NIP-44 for other NIPs (nostr-dev-kit/ndk#279) but not for NWC afaict.

[riccardobl]

i don't think we should try to monkeypatch NDK from our side, if anything, we should PR it to the NDK repo

[ekzyis]

Yes, or we fork it and do it ourselves since the maintainers don't seem to be very responsive. This ticket is just about keeping track that we need to find a solution.