DOC-500 add Jet payments demo (#720)

Import https://github.com/knurl/jetpayments to official repo.

https://hazelcast.atlassian.net/browse/DOC-500

Checklist:
- [x] Request reviewers if possible
- [x] README.md or README.adoc is created with a description _what_
example does and _how_ to run it
- [ ] Add tests that reproduce the associated tutorial or similar
scenario

Author: Rob-Hazelcast

jet-payments-kotlin/.gitignore

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+.gradle/
+.idea/
+.kotlin/
+build/

jet-payments-kotlin/LICENSE

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jet-payments-kotlin/README.md

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+# Jet Kotlin payments
+
+Code used in a demonstration, not intended for general use.
+
+Summary:
+
+- A simple pipeline on Jet, written in Kotlin
+
+- Real time ingest of payment requests from Kafka, and processing of those on Jet
+
+- Automatic grouping of each merchant’s payments to the same node
+
+- Automatic scaling upon failure conditions
+
+- Zero loss and exactly-once semantics

jet-payments-kotlin/build.gradle.kts

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+plugins {
+    kotlin("jvm") version "2.1.21"
+    kotlin("plugin.serialization") version "2.1.21"
+    application
+}
+
+group = "org.hazelcast"
+version = "1.0"
+
+private val javaVersion = 21
+private val kotlinVersion = "2.1.21" // can't substitute in plugins section above
+private val hazelcastVersion = "5.5.0"
+
+repositories {
+    mavenCentral()
+    maven {
+        url = uri("https://packages.confluent.io/maven/")
+    }
+    maven {
+        url = uri("https://repository.hazelcast.com/release/")
+    }
+    mavenLocal()
+    gradlePluginPortal()
+}
+
+dependencies {
+    testImplementation("io.kotest:kotest-runner-junit5:5.8.0")
+    testImplementation("io.kotest:kotest-assertions-core:5.8.0")
+    testImplementation("io.kotest:kotest-property:5.8.0")
+    // For testing coroutines
+    testImplementation("io.kotest:kotest-assertions-core-jvm:5.8.0")
+
+    /*
+     * Core kotlin libs. We'll need these on all Hazelcast members when using Jet.
+     */
+    implementation("org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.10.2")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.8.0")
+
+    /*
+     * Hazelcast.
+     */
+    implementation("com.hazelcast:hazelcast:$hazelcastVersion")
+    implementation("com.hazelcast.jet:hazelcast-jet-kafka:$hazelcastVersion")
+
+    /*
+     * Kafka
+     */
+    implementation("com.google.cloud.hosted.kafka:managed-kafka-auth-login-handler:1.0.6")
+    implementation("org.slf4j:slf4j-nop:2.0.16") // Quiets an annoying message SLF4J: Failed to load class org.slf4j.impl.StaticLoggerBinder
+}
+
+application {
+    mainClass.set("org.hazelcast.jetpayments.MainKt")
+}
+
+tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
+    compilerOptions {
+        allWarningsAsErrors = true
+        progressiveMode = true
+        freeCompilerArgs.addAll(listOf(
+            "-Xjsr305=strict",
+        ))
+    }
+}
+
+tasks.withType<Test> {
+    useJUnitPlatform()
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(javaVersion)
+        vendor = JvmVendorSpec.ORACLE
+    }
+}
+
+kotlin {
+    jvmToolchain {
+        languageVersion = JavaLanguageVersion.of(javaVersion)
+        vendor = JvmVendorSpec.ORACLE
+    }
+}

jet-payments-kotlin/gradle.properties

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+kotlin.code.style=official
+org.gradle.jvmargs=-XX:+UseZGC

jet-payments-kotlin/gradle/gradle-daemon-jvm.properties

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+#This file is generated by updateDaemonJvm
+toolchainVersion=21

jet-payments-kotlin/gradle/wrapper/gradle-wrapper.jar

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists