Release 2.2

* [Conf] Antivirus: Fix the default config
* [Feature] Add verdict library in lua
* [Feature] Allow exception when choosing upstream
* [Feature] Allow to disable symbols from the metric config
* [Feature] Allow to limit maps per specific worker
* [Feature] Always validate Rspamd protocol output
* [Feature] Antivirus: Add preliminary virustotal support
* [Feature] Clickhouse: Rework Clickhouse collection logic
* [Feature] Improve base64 usage
* [Feature] Shutdown timeout is now associated with task timeout
* [Fix] #3129 Multiple classifiers on redis working incorrectly
* [Fix] Allow real upstreams configuration
* [Fix] Another try to fix slow callbacks and timers
* [Fix] Check results of write message as SSL can bork them
* [Fix] Clickhouse: Avoid potential races in collection
* [Fix] Clickhouse: Fix periodic script
* [Fix] Fail DNS upstream on each retransmit attempt
* [Fix] Fix consistent hashing when upstreams are marked inactive
* [Fix] Fix issues found
* [Fix] Fix off-by-one in retries for the proxy
* [Fix] Fix termination
* [Fix] Fix upstreams exclusion logic
* [Fix] Fix utf8 validation for symbols options and empty strings
* [Fix] Oops, fix maps reload
* [Fix] Rbl: Allow utf8 lookups for IDN domains
* [Fix] Sigh, another try to fix brain-damaged openssl
* [Project] Add fast utf8 validation library
* [Project] Use own utf8 validation instead of glib
* [Rework] Another phase of finish actions rework
* [Rework] Further cmake system rework
* [Rework] Further isolation of the controller's functions
* [Rework] Make cmake structure more modular
* [Rework] Move cmake modules to a dedicated path
* [Rework] Replace controller functions by any scanner worker if needed
* [Rework] Rework final scripts logic
* [Rework] Rewrite rspamd_str_make_utf_valid function
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