Enhance Code Quality

This MR aims to improve code quality, it includes refactoring and restructuring and code formatting. In particular, it includes:

• Copying the examples folder to the Docker images, this makes it possible to use the examples as default execution and benchmark even in standalone mode
• Renaming TheodoliteYamlExecutor to TheodoliteStandalone
• Replace KafkaLagExporterRemover with ResourceByLabelHandler. This handler encapsulates all requests to Kubernetes resources via labels
• Replace fabric8 DefaultKubernetesClient with NamespacedKubernetesClient, this way we can simplify some calls (inNamespace() can be removed)
• Extract the code for adding an additional label patcher from TheodoliteController into a new class ConfigOverrideModifier. Add test for this ConfigOverrideModifier
• Extract the State Comperator from TheodoliteController into a new class ExecutionComparator
• Add ImagePatcher to the PatcherFactory
• Some minor code changes, like changing the type of exceptions, code formatting or cleanup, updating KDoc

Closes #209 (closed)