[Compiler CLI] Sort flags and features before appending them to string

JS IR BE incremental compilation infrastructure uses
 LanguageVersionSettings::toString method to detect if any
 compiler features or flags were enabled or disabled.
 It is important that the features and flags order are stable
 in the result string.

^KT-56580 Fixed

js/js.translator/testData/incremental/invalidation/languageVersionSettings/main/m.kt

@@ -0,0 +1,7 @@
+fun box(stepId: Int): String {
+    when (stepId) {
+        in 0..7 -> if (demo() != 42) return "Fail"
+        else -> return "Unknown"
+    }
+    return "OK"
+}

js/js.translator/testData/incremental/invalidation/languageVersionSettings/main/module.info

@@ -0,0 +1,10 @@
+STEP 0..3:
+    dependencies: lib1
+    added file: m.kt
+STEP 4..5:
+    dependencies: lib1
+STEP 6:
+    dependencies: lib1
+    added file: m.kt
+STEP 7:
+    dependencies: lib1