[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/lib1/l1.kt

@@ -0,0 +1 @@
+fun demo() = 42

js/js.translator/testData/incremental/invalidation/languageVersionSettings/lib1/module.info

@@ -0,0 +1,6 @@
+STEP 0..3:
+    added file: l1.kt
+STEP 4..5:
+STEP 6:
+    added file: l1.kt
+STEP 7: