[JAMES-3897] IP filtering with CrowdSec - ASF JIRA

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Thanks to recommandation from a collegue Xavier GUIMARD, I discovered CrowdSec ( https://www.crowdsec.net/ ).

CrowdSec is a free, modern & collaborative behavior detection engine, coupled with a global IP reputation network, based on IA behaviour refinement.

Develop a third-party plugin for questionning crowdSec:

Create a SMTP EHLO hook questionning via a REST call the CrowdSec local agent
Create a mailet questionning via a REST call the CrowdSec local agent
Create a mailet to provision local CrowdSec database (for highest level of spam for instance)
Think about the interfaces we would need to question CrowdSec upon incoming IMAP connections
Externalize behaviour linked to failed login attempts (sleep, 3 failure connection closure) as configurable extensible plugins.
Use it to manage IP reporting to crowdSec, especially upon failed authentications (~fail2ban).