chore: migrate airbyte-micronaut-temporal:main to kotlin (#16818)

Discussed with reviewer offline that this was approved. They forgot to hit the button before they went on vacation.

Author: cgardens

airbyte-micronaut-temporal/build.gradle.kts

@@ -6,6 +6,8 @@ plugins {
 dependencies {
   annotationProcessor(platform(libs.micronaut.platform))
   annotationProcessor(libs.bundles.micronaut.annotation.processor)
+  ksp(platform(libs.micronaut.platform))
+  ksp(libs.bundles.micronaut.annotation.processor)
 
   implementation(libs.bundles.micronaut)
   implementation(libs.byte.buddy)

airbyte-micronaut-temporal/src/main/java/io/airbyte/micronaut/temporal/TemporalActivityStubGeneratorFunction.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2020-2025 Airbyte, Inc., all rights reserved.
+ */
+
+package io.airbyte.micronaut.temporal
+
+import io.temporal.activity.ActivityOptions
+
+/**
+ * Functional interface that defines the function used to generate a Temporal activity stub.
+ *
+ * @param <C> The Temporal activity stub class.
+ * @param <A> The [ActivityOptions] for the Temporal activity stub.
+ * @param <O> The Temporal activity stub object.
+ */
+fun interface TemporalActivityStubGeneratorFunction<C : Class<*>, A : ActivityOptions, O> {
+  fun apply(
+    c: C,
+    a: A,
+  ): O
+}