sys/net: refactor AODVv2 and RFC 5444

[jeandudey]

Description

• Adds separate RFC 5444 module that can be used without AODVv2 (easier testing, less surprises).
• Adds a test for the new module.
• Compiles and tests on the GitHub Workflow.

This can be tested on native, Turpial or cc1312-launchpad and any micro controller with sufficient RAM.

Also works on the ESP32 :wink: if we someday are going to use the powerful ESP-NOW interface which is pretty fast (in terms of Mbps) alongside the IEEE 802.15.4g interface. And yep, this RFC 5444 implementation allows the usage of multiple interfaces at the same time so it's not that distant to use an ESP32 or ESP8266 for these purposes.

Tesing

• make BOARD=native -C tests/rfc5444
• make BOARD=native -C tests/rfc5444 test

[jeandudey]

@xkevin190, @luisan00 this is now fully implemented with the respective integration tests (and everything works :tada: ). So please test with the given command and leave your review comments here :)

Will rebase after the reviews.