[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/project.info

@@ -0,0 +1,30 @@
+MODULES: lib1, main
+
+STEP 0:
+    libs: lib1, main
+    dirty js: lib1, main
+STEP 1:
+    language: +TypeAliases
+    libs: lib1, main
+    dirty js: lib1, main
+STEP 2:
+    language: +TypeAliases, +BoundCallableReferences, +LocalDelegatedProperties, +TopLevelSealedInheritance
+    libs: lib1, main
+    dirty js: lib1, main
+STEP 3:
+    language: +TypeAliases, +BoundCallableReferences, +TopLevelSealedInheritance
+    libs: lib1, main
+    dirty js: lib1, main
+STEP 4:
+    language: +BoundCallableReferences, +TopLevelSealedInheritance, +TypeAliases
+    libs: lib1, main
+STEP 5:
+    language: +BoundCallableReferences, +TypeAliases, +TopLevelSealedInheritance
+    libs: lib1, main
+STEP 6:
+    language: +BoundCallableReferences, -TypeAliases, +TopLevelSealedInheritance
+    libs: lib1, main
+    dirty js: lib1, main
+STEP 7:
+    language: +TopLevelSealedInheritance, +BoundCallableReferences, +TypeAliases
+    libs: lib1, main