Load execution ID from file

This MR introduces a new class IOHandler that encapsulates the most common I/O operations within the Theodolite framework. In order to do this, this MR also includes some restructuring/refactoring. With this handler, Theodolite uses a file expID.txt to store and load the execution ID for the next experiment.

theodolite-quarkus/src/main/kotlin/theodolite/util/IOHandler.kt

@@ -4,7 +4,6 @@ import com.google.gson.GsonBuilder
 import mu.KotlinLogging
 import java.io.File
 import java.io.PrintWriter
-import java.lang.IllegalArgumentException
 
 private val logger = KotlinLogging.logger {}