Upgrade to Java 17

[michael-simons]

This will happen with version 2.0 and includes:

• Removing the Java 11 and Java 17 extra directories (compiling only for Java 17)
• General improvements (text blocks, a couple of switch statements and the usual)
• Upgrade to Graal 22.2
• Add explicit tests for the module path (Turns out: I don't have too, stuff runs by default on mp, so 🤷 )
• Test resources are patched into the main module, class graph finds them twice, tests fails (Duplicate resources found with Maven / Surefire patching test resources into the module path. classgraph/classgraph#704, unsure if this should be seen as maven / buildtool, module path or class graph issue, decided to move the affected resources into a separate (maven) module instead of using <useModulePath>false</useModulePath>)