Create a uniffi-bindgen crate (#44)

We will be using [`uniffi-rs`](https://github.com/mozilla/uniffi-rs) to generate bindings, allowing foreign languages to be able to call into our Rust code.

For more information on `uniffi`, check out their excellent user guide:
https://mozilla.github.io/uniffi-rs/Overview.html

This PR does the setup for multi-crate workspace, as outlined in their user guide here:
https://mozilla.github.io/uniffi-rs/tutorial/foreign_language_bindings.html#multi-crate-workspaces

Cargo.toml

@@ -17,4 +17,7 @@ license-file = "LICENSE"
 thiserror = "1.0.50"
 serde = { version = "1.0.193", features = ["derive"] }
 serde_json = "1.0.108"
-serde_with = "3.4.0"
+serde_with = "3.4.0"
+
+# Update to released version once foreign traits are included (likely 0.26.0).
+uniffi = { git = "https://github.com/mozilla/uniffi-rs", rev = "7cd3aac735e905e1725d350a7a82d57aa50caaa1" }

bindings/uniffi-bindgen/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "uniffi-bindgen"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "uniffi-bindgen"
+path = "src/uniffi-bindgen.rs"
+
+[dependencies]
+uniffi = { workspace = true, features = ["cli"] }

bindings/uniffi-bindgen/src/uniffi-bindgen.rs

@@ -0,0 +1,3 @@
+fn main() {
+    uniffi::uniffi_bindgen_main()
+}