rework: enhance fail2ban Icinga2 check with new bans threshold

[JoyG1024]

• Added monitoring for new bans within a configurable time window (-m/-r/-R)
• Cleaned output for proper Icinga2 format
• Simplified per-jail display, removed IP list by default
• Retained total banned IPs monitoring with warning/critical thresholds
• Adjusted defaults to match site-specific values

Note: These changes have been made for personal use and on personal preference and as such may clash with the original creator's vision for the check, thus may be completely discarded

[JoyG1024]

Added the -q option for the new short version OK: fail2ban running | total_banned=4531;5000;10000 new_bans_60min=8;25;50 as the old list one just wasn't readable at all due to a flood of banned bot ip still i changed it so that view remains default

[n1tr0-5urf3r]

Thanks for your PR! I will hopefully find the time to review your changes in the next days

[n1tr0-5urf3r]

@JoyG1024 after finally having a look, I'm not sure why you removed the check for the fail2ban-server binary, which is now hardcoded. Also your PR removes the check for sudo permissions. Did something change in fail2ban so that they are not required anymore?

[JoyG1024]

@n1tr0-5urf3r I am not currently on my work machine but my intention was not to remove checks i most likely forgot them as i toke the code apart checking and playing around and since my machine was not missing the permissions it didn’t come back to mind.