refactor: Start using UniFFI proc-macro frontend

bindings/matrix-sdk-ffi/src/api.udl

@@ -1,9 +1,6 @@
 namespace sdk {
-    void setup_tracing(string configuration);
-
     MediaSource media_source_from_url(string url);
     MessageEventContent message_event_content_from_markdown(string md);
-    string gen_transaction_id();
 };
 
 [Error]
@@ -179,15 +176,15 @@ interface HomeserverLoginDetails {
 
 interface AuthenticationService {
     constructor(string base_path);
-    
+
     HomeserverLoginDetails? homeserver_details();
-    
+
     [Throws=AuthenticationError]
     void configure_homeserver(string server_name);
-    
+
     [Throws=AuthenticationError]
     Client login(string username, string password);
-    
+
     [Throws=AuthenticationError]
     Client restore_with_access_token(string token, string device_id);
 };

bindings/matrix-sdk-ffi/src/client.rs

@@ -262,6 +262,7 @@ impl Client {
     }
 }
 
-pub fn gen_transaction_id() -> String {
+#[uniffi::export]
+fn gen_transaction_id() -> String {
     TransactionId::new().to_string()
 }

bindings/matrix-sdk-ffi/src/lib.rs

@@ -57,6 +57,7 @@ impl From<anyhow::Error> for ClientError {
     }
 }
 
+#[uniffi::export]
 fn setup_tracing(configuration: String) {
     tracing_subscriber::registry()
         .with(EnvFilter::new(configuration))