integration_2023_w13

See merge request oai/openairinterface5g!2037

* !1945 Free RNTI related structures at PHY after UE disconnection
* !2011 Creation of new pipeline LTE-TDD-2x2-container
* !1854 Handle reconfigurationWithSync
* !2019 bugfix: LDPC decoding in the gNB: clear d properly
* !2038 Fix DL 2x2 errors
* !2039 Adding test-case in XML to reset USRP in LTE-TDD pipeline
* !2008 Implement NR-UE Deregistration procedure
* !2023 Rework PDCP OAI API to allow custom SRB data forwarding (e.g., in F1)
* !2015 Update documentation: CI, general README.md, overview of doc README, various improvements

The GTP module is common for 4G and 5G. It hardcodes the functions to
call when creating S1U and NGU tunnels. The S1U case is both applicable
for LTE and NR (NSA), which until now was not a problem as the PDCP data
forwarding functions where called pdcp_data_req. The issue is that in this
branch, the NR PDCP functions have changed to nr_pdcp_data_req_drb().

When setting up a GTP tunnel, we now pass the PDCP data forwarding
functions into GTP, since the caller knows whether it is in 4G or 5G,
but GTP itself does not.

Merge remote-tracking branch 'origin/develop-handle-reconfigurationWithSync' into integration_2023_w13

In the UE, we wish to handle ^C in the UE to send a message before
terminating, so we allow custom wait handlers to implement such
functionality. Use itti_wait_tasks_unblock() to unblock
itti_wait_tasks_end().

Also, implement itti_wait_tasks_end() using semaphores, as signals are
not async-signal-safe (and therefore should not be used in a signal
handler).