Add MITRE compatible ruleset

[hdtrinh]

Add MITRE compatible ruleset

This PR adds new rules for the rule-engine module compatible with MITRE Framework.

Each rule is enriched with a comprehensive description, severity level and additional information.
Rules have been organized in folders according to the MITRE threat category.

I have

• run cargo fmt;
• run cargo clippy;
• run cargo testand all tests pass;
• linked to the originating issue (if applicable).

[vadorovsky]

Just one comment, but overall looks good. Nice that we will mitigate more real attacks now!

On the side note, we could consider adding some YAML linter to CI - later, not in this PR. We have some very long lines (over 100 chars) and redundant whitespaces and here and there, but I'm not going to nitpick this PR with that, I prefer the CI to do that. 😅

[krsh]

There is a typo: the directory of rules is named rules / ("rules" + white space).
It should have been corrected before the merge.