feat: add boa

__lang/boa/src/main.rs

@@ -0,0 +1,14 @@
+use boa::Context;
+
+fn main() {
+    let mut context = Context::new();
+    let script = r##"
+        function helloworld() {
+            console.log('hello world');
+        }
+        helloworld();
+        "hello world!!!"
+    "##;
+    let v = context.eval(script).expect("Eval failed!");
+    println!("{:?}", v);
+}