[Draft] Protection to apply YARA Rules

[MTRNord]

This adds a new protection.

This protection is utilizing https://github.com/VirusTotal/yara/ for a condition based pattern detection mechanism.

Its still fairly early into the work but some things for example are rules like https://github.com/MTRNord/matrix-yararules/blob/main/rules/detect_tokens.yara which then do this:

(the initial message was a text file with a synapse and a github token)

Things it adds:

• A way to define simple and complex pattern matching rules
• A way to define actions taken when these match
• Matching of json constructs via the methods available using https://github.com/JeromeHadorn/YARA-JSON

Things planned but missing:

• Disabling rules based on tag groups
• Runtime reloading of rules

As usual: Please note that this is NOT production ready in any way. Also please read up on things like https://www.cisa.gov/news-events/news/traffic-light-protocol-tlp-definitions-and-usage before usage since these rules can also be used against you if they are public.