Add configBlock

Author: lauzadis

aws-crt-kotlin/native/src/aws/sdk/kotlin/crt/WithCrt.kt

@@ -7,8 +7,10 @@ package aws.sdk.kotlin.crt
 /**
  * A mixin class used to ensure CRT is initialized before the class is invoked
  */
-public open class WithCrt {
+public open class WithCrt(configBlock: Config.() -> Unit = {}) {
     init {
-        CRT.initRuntime { }
+        CRT.initRuntime {
+            configBlock()
+        }
     }
 }