fix: KMP JMESPath utils (#986)

Author: lauzadis

codegen/smithy-kotlin-codegen/src/test/kotlin/software/amazon/smithy/kotlin/codegen/KotlinSettingsTest.kt

@@ -5,7 +5,6 @@
 
 package software.amazon.smithy.kotlin.codegen
 
-import org.junit.jupiter.api.assertThrows
 import software.amazon.smithy.codegen.core.CodegenException
 import software.amazon.smithy.kotlin.codegen.test.TestModelDefault
 import software.amazon.smithy.kotlin.codegen.test.toSmithyModel
@@ -284,7 +283,7 @@ class KotlinSettingsTest {
             }
         """.trimIndent()
 
-        assertThrows<IllegalArgumentException> {
+        assertFailsWith<IllegalArgumentException> {
             KotlinSettings.from(
                 model,
                 Node.parse(contents).expectObjectNode(),

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

@@ -6,6 +6,7 @@
 package aws.smithy.kotlin.runtime.util
 
 import aws.smithy.kotlin.runtime.InternalApi
+import kotlin.jvm.JvmName
 
 @InternalApi
 public fun Short.toNumber(): Short = this
@@ -64,3 +65,11 @@ public fun Any?.type(): String = when (this) {
     null -> "null"
     else -> throw Exception("Undetected type for: $this")
 }
+
+@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()