Allow pattern-matching on bytearrays

- Doesn't allow pattern-matching on G1/G2 elements and strings,
    because the use cases for those is unclear and it adds complexity to
    the feature.

  - We still _parse_ patterns on G1/G2 elements and strings, but emit an
    error in those cases.

  - The syntax is the same as for bytearray literals (i.e. supports hex,
    utf-8 strings or plain arrays of bytes).

crates/aiken-lsp/src/lib.rs

@@ -34,7 +34,7 @@ pub fn start() -> Result<(), Error> {
     let (connection, io_threads) = Connection::stdio();
 
     // Run the server and wait for the two threads to end (typically by trigger LSP Exit event).
-    let server_capabilities = serde_json::to_value(&capabilities())?;
+    let server_capabilities = serde_json::to_value(capabilities())?;
 
     let initialization_params = connection.initialize(server_capabilities)?;
     let initialize_params = serde_json::from_value(initialization_params)?;