Migrate compiler, idea and others to new case conversion api

native/commonizer/src/org/jetbrains/kotlin/commonizer/cli/BooleanOptionType.kt

@@ -11,7 +11,7 @@ internal class BooleanOptionType(
     mandatory: Boolean
 ) : OptionType<Boolean>(alias, description, mandatory) {
     override fun parse(rawValue: String, onError: (reason: String) -> Nothing): Option<Boolean> {
-        val value = rawValue.toLowerCase().let {
+        val value = rawValue.lowercase().let {
             when (it) {
                 in TRUE_TOKENS -> true
                 in FALSE_TOKENS -> false

native/commonizer/src/org/jetbrains/kotlin/commonizer/cli/StatsTypeOptionType.kt

@@ -17,7 +17,7 @@ internal object StatsTypeOptionType : OptionType<StatsType>("log-stats", DESCRIP
 
 private val DESCRIPTION = buildString {
     StatsType.values().joinTo(this) {
-        val item = "\"${it.name.toLowerCase()}\""
+        val item = "\"${it.name.lowercase()}\""
         if (it == StatsType.NONE) "$item (default)" else item
     }
     append(";\nlog commonization stats")

native/commonizer/src/org/jetbrains/kotlin/commonizer/cli/nativeTasks.kt

@@ -77,7 +77,7 @@ internal class NativeKlibCommonize(options: Collection<Option<*>>) : Task(option
             progressLogger = progressLogger
         ).run()
 
-        statsCollector?.writeTo(FileStatsOutput(destination, statsType.name.toLowerCase()))
+        statsCollector?.writeTo(FileStatsOutput(destination, statsType.name.lowercase()))
     }
 }
 
@@ -127,7 +127,7 @@ internal class NativeDistributionCommonize(options: Collection<Option<*>>) : Tas
             progressLogger = progressLogger
         ).run()
 
-        statsCollector?.writeTo(FileStatsOutput(destination, statsType.name.toLowerCase()))
+        statsCollector?.writeTo(FileStatsOutput(destination, statsType.name.lowercase()))
 
         println("$description: Done")
     }