v2.2.3: Refactored Repository Structure

- support for signing requests ( by setting the "key" - property in config)
- fix possible memory leaks
- optimize configuration
- add valgrind and QEMU to the CI 
- allow non stats requests
- add user-agent with version to requests
- added examples to the doc (java, python, wasm)
- activate nodelist filtering
- added verified hashes cache to improve performance
- added Generics to wasm with suupport for custom converters
- Update lastNodeList only after response is verified