RACH preamble sniffer

[cueltschey]

We need to make a sniffer program that can decode RACH preambles (msg1) going over the air. This will serve as a base for various replay and spoofing attacks, as well as providing more info on the channel to the system.

Code for capturing and decoding RACH can be reused from srsRAN's gNB. We already have an example of this in this repo

Required steps:

• Capture IQ of PRACH messages
• Decode them
• Send information on decoded messages to influxdb
• Do this on a variety of bands
• Allow configuration and automation
• Start working on replay and spoofing attacks