Add recognition and classification of WebAssembly (#3650)

samples/WebAssembly/add.wat

@@ -0,0 +1,14 @@
+(module
+  (import "env" "printInt" (func $printInt (param i32)))
+  (func $add (param $lhs i32) (param $rhs i32) (result i32)
+    get_local $lhs
+    get_local $rhs
+    i32.add
+  )
+
+  (func $main
+    (call $printInt
+      (call $add (i32.const 9) (i32.const 8))))
+
+  (export "main" (func $main))
+)