Using multiple uniffi libraries together meta issue

[thunderbiscuit]

This issue tracks a number of related-or-maybe-not-related issues we have found over the past few weeks relating to the use of multiple uniffi-based libraries used in the same project.

Issues

1. The glue code created from bitcoin-ffi includes types the bdk-ffi library has not imported in its UDL. Issue with types not used in libraries that depend on bitcoin-ffi bitcoin-ffi#27. The related uniffi issue is Issue using only a few types from a uniffi dependency in a uniffi library  mozilla/uniffi-rs#2282
2. Using different versions of uniffi in completely separate libraries built with uniffi creates application compilation errors in Swift (@jurvis)
3. Using BDK + LDK Node in the same project does not build LDK Node + BDK #620
4. Importing multiple swift bindings modulemap collision Importing multiple swift bindings modulemap collision #621

[thunderbiscuit]

The way to import external types is changing significantly with the new release of uniffi: see https://github.com/mozilla/uniffi-rs/blob/main/CHANGELOG.md#%EF%B8%8F-breaking-changes-%EF%B8%8F.

I don't know if this would solve or change anything for us, but we could test it out using the main branch of uniffi.