Draft: SA Throughput and Downlink SISO Channel Modeling

This commit contains the following changes:

• Bug fixes in the NRUE MAC layer for setting the scheduled SFN/slot of DL HARQs
• Adding 'on_error' function, which will report if any push/pull fails in nFAPI
• Setting several changes in the MAC layer to only be executed for our emulated_L1 mode
• Sending UCI indications from the stub function only from the PUCCH
• Not building UCI indications from the DLSCH
• num_uci calculation bug fix in NRUE MAC layer
• Filtering UL_TTI_REQs to lower the number of UL_TTI_REQs in the queue
• Bug fixes in the use of push/pull array32s in P7 nFAPI
• Implemented channel modeling for the downlink on the UE side. (i.e.: Added abstracted parameters in UCI_INDICATION.)
• Trigger the ul_harq reporting from UL_TTI_REQ reception
• MCS value update limit was adjusted on the gNB side, but should be updated in the future since we are not currently handling DTXs