[JS IR] Lift lambdas that capture no context

If a lambda expression does not capture any local variables, convert
it to a global free function and replace the lambda creation with
a reference to that function.

Example: for the following Kotlin code

```kotlin
fun foo(f: () -> Unit) = f()

fun bar() = foo { console.log("hello") }
```

before this patch, we generated:

```js
function foo(f) {
  return f();
}
function bar() {
  return foo(bar$lambda());
}
function bar$lambda() {
  return function () {
    console.log('hello');
  };
}
```

after this patch, we generate:

```js
function foo(f) {
  return f();
}
function bar() {
  return foo(bar$lambda);
}
function bar$lambda() {
  console.log('hello');
}
```

compiler/testData/codegen/boxInline/defaultValues/lambdaInlining/defaultLambdaInNoInline.kt

@@ -9,7 +9,7 @@ inline fun inlineFun(crossinline inlineLambda: () -> String = { "OK" }, noinline
 
 // FILE: 2.kt
 // CHECK_CALLED_IN_SCOPE: function=inlineFun$lambda_0 scope=box TARGET_BACKENDS=JS
-// CHECK_CALLED_IN_SCOPE: function=box$lambda scope=box IGNORED_BACKENDS=JS
+// HAS_NO_CAPTURED_VARS: function=box except=box$lambda IGNORED_BACKENDS=JS
 import test.*
 
 fun box(): String {

compiler/testData/codegen/boxInline/defaultValues/lambdaInlining/noInline.kt

@@ -10,7 +10,7 @@ fun call(lambda: () -> String ) = lambda()
 
 // FILE: 2.kt
 // CHECK_CALLED_IN_SCOPE: function=inlineFun$lambda scope=box TARGET_BACKENDS=JS
-// CHECK_CALLED_IN_SCOPE: function=box$lambda scope=box IGNORED_BACKENDS=JS
+// HAS_NO_CAPTURED_VARS: function=box except=box$lambda;call IGNORED_BACKENDS=JS
 // CHECK_CALLED_IN_SCOPE: function=call scope=box
 import test.*