FFI Tracking Issue

[spacebear21]

This is a tracking issue for high-level items related to FFI and language bindings.

FFI

• Complete the payjoin-ffi transfer from LtbLightning #734
• Test payjoin_ffi backwards compatibility with v1 #736
• Audit payjoin-ffi's ImplementationError From implementation #737
• Squash payjoin-ffi/uniffi feature into default behavior after dart-uniffi bindings work #790

Individual language bindings

• Uniffi dart #829
  • Upgrade Bull Bitcoin Mobile from payjoin-flutter to payjoin_dart
  • Upgrade Cake Wallet from payjoin-flutter to payjoin_dart
• Kotlin bindings (relevant draft PR: Add initial scaffolding for Kotlin Multiplatform (Android target only for now) LtbLightning/payjoin-ffi#72)
• Swift bindings
  • demand from FullyNoded Feature: Payjoin Fonta1n3/FullyNoded#271
• Support WASM with wasm_bindgen and conditional compilation #740