Introduce Throwable.toStringWithTrace

#KT-37603

libraries/stdlib/common/src/kotlin/ExceptionsH.kt

@@ -118,6 +118,17 @@ internal class KotlinNothingValueException : RuntimeException {
 }
 
 
+/**
+ * Returns the detailed description of this throwable with its stack trace.
+ *
+ * The detailed description includes:
+ * - the short description (see [Throwable.toString]) of this throwable;
+ * - the complete stack trace;
+ * - detailed descriptions of the exceptions that were [suppressed][suppressedExceptions] in order to deliver this exception;
+ * - the detailed description of each throwable in the [Throwable.cause] chain.
+ */
+@SinceKotlin("1.4")
+public expect fun Throwable.toStringWithTrace(): String
 /**
  * When supported by the platform, adds the specified exception to the list of exceptions that were
  * suppressed in order to deliver this exception.