Add support for records

[Zegveld]

Currently when placing the @Builder annotation on a record the following exception occurs:

Internal error in the builder processor: javax.lang.model.element.UnknownElementException: Unknown element: "nl.loxia.izb.raildetailservice.domein.OrBranchObject"
    at [email protected]/javax.lang.model.util.AbstractElementVisitor6.visitUnknown(AbstractElementVisitor6.java:129)
    at [email protected]/javax.lang.model.util.ElementKindVisitor6.visitTypeAsRecord(ElementKindVisitor6.java:231)
    at [email protected]/javax.lang.model.util.ElementKindVisitor6.visitType(ElementKindVisitor6.java:160)
    at jdk.compiler/com.sun.tools.javac.code.Symbol$ClassSymbol.accept(Symbol.java:1575)
    at nl.loxia.builder.generator.ap.BuilderProcessor.asTypeElement(BuilderProcessor.java:254)
    at nl.loxia.builder.generator.ap.BuilderProcessor.getBuildersToGenerate(BuilderProcessor.java:226)
    at nl.loxia.builder.generator.ap.BuilderProcessor.process(BuilderProcessor.java:169)
    at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:1023)
    at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:939)
    at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1267)
    at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1382)
    at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1234)
    at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:916)
    at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:104)
    at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.invocationHelper(JavacTaskImpl.java:152)
    at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:100)
    at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:94)
    at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess(JavaxToolsCompiler.java:126)
    at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile(JavacCompiler.java:169)
    at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:1188)
    at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:212)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:126)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2(MojoExecutor.java:328)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute(MojoExecutor.java:316)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:174)
    at org.apache.maven.lifecycle.internal.MojoExecutor.access$000(MojoExecutor.java:75)
    at org.apache.maven.lifecycle.internal.MojoExecutor$1.run(MojoExecutor.java:162)
    at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute(DefaultMojosExecutionStrategy.java:39)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:159)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:105)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:193)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:180)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
    at java.base/java.lang.Thread.run(Thread.java:833)