[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/funInterface/samConversionToGenericInterfaceInGenericFun.kt

@@ -1,3 +1,6 @@
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: SAM_CONVERSIONS
+
 fun interface FunIFace<T, R> {
     fun call(ic: T): R
 }