Rename TimeZone.kt to avoid class file conflict in JVM

Author: ilya-g

core/commonMain/src/TimeZone.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
  */
 
+@file:kotlin.jvm.JvmMultifileClass
+@file:kotlin.jvm.JvmName("TimeZoneKt")
+
 package kotlinx.datetime
 
 public expect open class TimeZone {

core/jvmMain/src/TimeZone.kt renamed to core/jvmMain/src/TimeZoneJvm.kt

@@ -3,6 +3,9 @@
  * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
  */
 
+@file:JvmMultifileClass
+@file:JvmName("TimeZoneKt")
+
 package kotlinx.datetime
 
 import java.time.DateTimeException