Allow uniffi_automerge to be consumed as a crate dependency

Currently two static libraries generated by a Rust toolchain cannot be
linked together in a single binary due to symbol conflicts (see
rust-lang/rust#104707). This is a problem for
WebAssembly targets, where dynamic linking is not stable yet. To link
multiple Rust-originated static libraries together, we need to produce
a single static library from an umbrella crate that re-exports everything
from its dependencies.

This change allows `uniffi_automerge` to be consumed as a crate dependency
by the umbrella crate.

rust/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [lib]
-crate-type = ["staticlib"]
+crate-type = ["staticlib", "rlib"]
 name = "uniffi_automerge"
 
 [[bin]]