JS: replace all usages of @native annotation with external modifier, in tests, stdlib, etc

js/js.translator/testData/box/crossModuleRef/constructor.kt

@@ -6,7 +6,7 @@ class A(val x: Int) {
     constructor(a: Int, b: Int) : this(a + b)
 }
 
-@native class B(x: Int) {
+external class B(x: Int) {
     constructor(a: Int, b: Int) : this(0) {}
 
     val x: Int

js/js.translator/testData/box/crossModuleRef/topLevelFunction.kt

@@ -5,7 +5,7 @@ package lib
 
 fun foo() = 23
 
-@native fun bar(): Int = noImpl
+external fun bar(): Int = noImpl
 
 inline fun baz() = 99
 

js/js.translator/testData/box/crossModuleRef/topLevelProperty.kt

@@ -7,9 +7,9 @@ val foo = 23
 val boo: Int
     get() = 42
 
-@native val bar: Int = noImpl
+external val bar: Int = noImpl
 
-@native val far: Int
+external val far: Int
     get() = noImpl
 
 // TODO: annotations like this are not serialized properly. Uncomment after KT-14529 gets fixed
@@ -20,7 +20,8 @@ val fuzz: Int
 
 inline fun fetchFoo() = foo
 
-@JsName("fee") val tee = 2525
+@JsName("fee")
+val tee = 2525
 
 // FILE: lib.js