fix: create JMESPATH flattenIfPossible functions for Lists

Author: 0marperez

runtime/runtime-core/common/src/aws/smithy/kotlin/runtime/util/JMESPath.kt

@@ -66,10 +66,20 @@ public fun Any?.type(): String = when (this) {
     else -> throw Exception("Undetected type for: $this")
 }
 
+// Collection `flattenIfPossible`` functions
 @InternalApi
 @JvmName("noOpUnnestedCollection")
 public inline fun <reified T> Collection<T>.flattenIfPossible(): Collection<T> = this
 
 @InternalApi
 @JvmName("flattenNestedCollection")
 public inline fun <reified T> Collection<Collection<T>>.flattenIfPossible(): Collection<T> = flatten()
+
+// List `flattenIfPossible` functions
+@InternalApi
+@JvmName("noOpUnnestedCollection")
+public inline fun <reified T> List<T>.flattenIfPossible(): List<T> = this
+
+@InternalApi
+@JvmName("flattenNestedCollection")
+public inline fun <reified T> List<List<T>>.flattenIfPossible(): List<T> = flatten()