[Enhancement] Add 4G/5G signal stats (RSRP, SNR, etc) to collection

[eponerine]

In an effort to track band, latency, and other status, it would be super-helpful to also scrape the 4G/5G connection stats and output them. Things like RSRP, SNR, etc:

I believe all of this is found on the fastmile_radio_status_web_app.cgi endpoint:

It looks like the hard work is already done here, you're just limiting the data returned to the Band: https://github.com/highvolt-dev/tmo-monitor/blob/dfc0d1aeb5431b9f7f8f84a0728816755cde52a4/tmo_monitor/gateway/nokia.py#L134-L146

I only have a Nokia trashcan, so I cannot confirm what this looks like on other gateways.

Apologies if this has been asked or requested, but a quick search for "RSRP" yielded nothing.