[Konvert] Convert Templates class to Kotlin (#41)

This is a straight conversion with no functionality changes.

Extracted from #29.

Author: Nava2

build.gradle.kts

@@ -62,6 +62,7 @@ dependencies {
   api("org.assertj:assertj-core:3.24.2")
   api("org.assertj:assertj-assertions-generator:2.2.1")
 
+  implementation(gradleKotlinDsl())
   implementation("com.google.guava:guava:31.1-jre")
 
   testCompileOnly("org.jetbrains:annotations:24.0.1")

src/main/groovy/org/assertj/generator/gradle/tasks/AssertJGenerationTask.groovy

@@ -49,7 +49,7 @@ class AssertJGenerationTask extends SourceTask {
     final FileCollection templateFiles
 
     @Input
-    final ListProperty<SerializedTemplate> templates
+    final ListProperty<SerializedTemplate> generatorTemplates
 
     @OutputDirectory
     final DirectoryProperty outputDir
@@ -68,8 +68,10 @@ class AssertJGenerationTask extends SourceTask {
                 .from(sourceSet.runtimeClasspath)
 
         this.outputDir = assertJOptions.outputDir
+        // TODO Make `templates.templateFiles` `internal` once `AssertJGenerationTask` is Kotlin
         this.templateFiles = assertJOptions.templates.templateFiles
-        this.templates = assertJOptions.templates.templates
+        // TODO Make `templates.generatorTemplates` `internal` once `AssertJGenerationTask` is Kotlin
+        this.generatorTemplates = assertJOptions.templates.generatorTemplates
     }
 
     @TaskAction
@@ -141,7 +143,7 @@ class AssertJGenerationTask extends SourceTask {
                 classes - filteredClasses,
         )
 
-        def templates = assertJOptions.templates.templates.get().collect { it.maybeLoadTemplate() }.findAll()
+        def templates = assertJOptions.templates.generatorTemplates.get().collect { it.maybeLoadTemplate() }.findAll()
         for (template in templates) {
             generator.register(template)
         }