Use AutoValue to generate DrasylConfig class

Summary:

• AutoValue does not allow the usage of constructors. Therefore I had to change the API of the class. Constructor replaced with DrasylConfig#of.
• Validation is now (additionally) also performed for configurations generated by DrasylConfig.Builder.

To Do:

• Test with native image

---

https://sonarcloud.io/dashboard?branch=auto-value-DrasylConfig&id=org.drasyl%3Aparent