New dependency on rust in akonadi-search

[Carl Schwan]

Hi,

I'm planning to add a rust dependency to akonadi-search to parse html email in 
a safer way. Motivation for that is that I'm getting regularly crashed for the 
akonadi search indexer because it's parsing untrusted html emails from the 
internet. So instead of using QTextDocument which wasn't created for parsing 
untrusted html, it's using the html parser from servo which is spec compliant 
and better handle broken html. 

Here is the MR in question:
https://invent.kde.org/pim/akonadi-search/-/merge_requests/20

This uses the Corrosion library to integrate with cmake and c++ which is also 
used by another Gear package: Angelfish for the adblock feature and I was 
thinking about also adding to NeoChat for providing search in e2ee rooms via 
the seshat library[1]. Dependency updates of the rust packaging is handled by 
gitlab-dependabot[2] which should ensure everything stays up to date for the 
rust dependencies.

The dependency would be for now only recommanded but not required to give some 
times for distros too adapt their packaging. Hopefully since the kernel and 
many GNOME apps use rust, the infrastructure for packaging rust apps should be 
in place nowadays. I will also mark bug reports with backtrace pointing to 
crash inside QTextDocument (e.g. the one in the MR descritopn) as downstream 
issues, as their is little I can do to fix this sort of issues upstream.

Cheers,
Carl

[1]: https://github.com/matrix-org/seshat
[2]: https://dependabot-gitlab.gitlab.io/dependabot/
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