samkgg-3 Add logging

Updated app for AWS Lambda Powertools logging.

build.gradle
Added Powertools dependencies, which required lowering JVM target from 17 to 16 due to AspectJ limitation.

reflect-config.json, resource-config.json
Adding log4j2 makes GraalVM complain loudly. You have to add a lot to those files to get it to run without crashing.
Followed example here: https://github.com/muellerc/graalvm-sandbox/tree/main/log4j2-sandbox/src/main/resources/META-INF/native-image/com.amazonaws.sample.cmr.sns-throughput-optimization/log4j2-sandbox
From this thread: oracle/graal#2008

HelloWorldFunction/build.gradle

@@ -2,7 +2,11 @@ plugins {
     id 'application'
     id 'org.graalvm.buildtools.native'
     id 'org.jetbrains.kotlin.jvm' version '1.7.10'
+    // For Spock
     id 'groovy'
+    // For AWS Lambda Powertools
+    id 'java'
+    id 'io.freefair.aspectj.post-compile-weaving' version '6.5.1'
 }
 
 repositories {
@@ -27,6 +31,8 @@ dependencies {
     testImplementation platform('org.spockframework:spock-bom:2.2-groovy-4.0')
     testImplementation 'org.spockframework:spock-core'
     testImplementation 'org.apache.groovy:groovy-all:4.0.4'
+
+    aspect 'software.amazon.lambda:powertools-logging:1.12.3'
 }
 
 graalvmNative {
@@ -45,12 +51,14 @@ test {
 
 compileKotlin {
     kotlinOptions {
-        jvmTarget = "17"
+        jvmTarget = "16"
     }
 }
+sourceCompatibility = 16
+targetCompatibility = 16
 
 compileTestKotlin {
     kotlinOptions {
-        jvmTarget = "17"
+        jvmTarget = "16"
     }
 }

HelloWorldFunction/src/main/kotlin/helloworld/App.kt

@@ -4,12 +4,18 @@ import com.amazonaws.services.lambda.runtime.Context
 import com.amazonaws.services.lambda.runtime.RequestHandler
 import com.amazonaws.services.lambda.runtime.events.APIGatewayV2HTTPEvent
 import com.amazonaws.services.lambda.runtime.events.APIGatewayV2HTTPResponse
+import org.apache.logging.log4j.LogManager
+import software.amazon.lambda.powertools.logging.Logging
 
 /**
  * Handler for requests to Lambda function.
  */
 class App : RequestHandler<APIGatewayV2HTTPEvent?, APIGatewayV2HTTPResponse> {
+
+    var log = LogManager.getLogger()
+    @Logging
     override fun handleRequest(input: APIGatewayV2HTTPEvent?, context: Context?): APIGatewayV2HTTPResponse {
+        log.info("Entered handleRequest.")
         val headers: MutableMap<String, String> = HashMap()
         headers["Content-Type"] = "application/json"
         headers["X-Custom-Header"] = "application/json"