[Wasm] Improve interface method dispatch

- Use typed Wasm tables for each interface method to avoid runtime
  function type check

- Use linear search by implemented interface rather than by individual
  virtual function signature

compiler/testData/codegen/box/callableReference/function/local/enumExtendsTrait.kt

@@ -1,3 +1,6 @@
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: IMPLICIT_INTERFACE_METHOD_IMPL
+
 interface Named {
     val name: String
 }