refactor(estree): add #[repr(transparent)] to config structs (#13212)

The `Config*` structs only contain a single field, so mark them `#[repr(transparent)]`.

Has no effect on perf, but it doesn't hurt, so on balance I think best to do it.

Author: overlookmotel

crates/oxc_estree/src/serialize/config.rs

@@ -12,6 +12,7 @@ pub trait Config {
 }
 
 /// Config for serializing AST with TypeScript fields.
+#[repr(transparent)]
 pub struct ConfigTS {
     ranges: bool,
 }
@@ -32,6 +33,7 @@ impl Config for ConfigTS {
 }
 
 /// Config for serializing AST without TypeScript fields.
+#[repr(transparent)]
 pub struct ConfigJS {
     ranges: bool,
 }
@@ -52,6 +54,7 @@ impl Config for ConfigJS {
 }
 
 /// Config for serializing AST with TypeScript fields, with fixes.
+#[repr(transparent)]
 pub struct ConfigFixesTS {
     ranges: bool,
 }
@@ -72,6 +75,7 @@ impl Config for ConfigFixesTS {
 }
 
 /// Config for serializing AST without TypeScript fields, with fixes.
+#[repr(transparent)]
 pub struct ConfigFixesJS {
     ranges: bool,
 }