message: fix: correct binding format
  Rename binding to bindings and use an array.
diff: @@ -109,11 +109,11 @@ pub fn create_metadata(bundle: &Bundle) -> String {
  r#"
  {{
  "body_part": "script",
  - "binding": {{
  + "bindings": [{{
  "name": "{name}",
  "type": "wasm_module",
  "part": "{name}"
  - }}
  + }}]
  }}
  "#,
  name = bundle.get_wasm_binding(),
  @@ -225,11 +225,11 @@ mod tests {
  r#"
  {
  "body_part": "script",
  - "binding": {
  + "bindings": [{
  "name": "wasmprogram",
  "type": "wasm_module",
  "part": "wasmprogram"
  - }
  + }]
  }
  "#
  );
  