Migrate Connection type to procedural macros

[thunderbiscuit]

Migration of the Connection type.

Docs pulled directly from the rusqlite crate: https://docs.rs/rusqlite/0.31.0/rusqlite/struct.Connection.html#method.open

One thing to note is that with proc macros, all methods in an impl block will be exported if that block is marked with the #uniffi::export annotation, meaning that if we want to keep some methods private/out of the public API for the bindings (for example the Connection::get_store()), they simply need to be brought into a separate impl block.

[reez]

One thing to note is that with proc macros, all methods in an impl block will be exported if that block is marked with the #uniffi::export annotation, meaning that if we want to keep some methods private/out of the public API for the bindings (for example the Connection::get_store()), they simply need to be brought into a separate impl block.

THANKS for calling this out, I was confused but then I looked at this and it cleared it up for me!

[reez]

ACK 2fd7aa1