5G nFAPI Improvement
This MR accomplishes the following:
- Bugfixes in packing/unpacking
- Adds uplink indication functionality
- Changes the nFAPI system architecture to account for architecture changes in the develop branch
- Adds nFAPI system documentation
- Removes hardcodings
Ultimately, we see a working nFAPI split (in the --phy-test mode) which is verified by connected OAI UE and observing DL/UL traffic and constellations.