asn1: add rtcmem wrapper

[buraksenkus]

I've added missing asn1c wrapper for RTCMEM

[riebl]

Hi @buraksenkus,

I will add the RTCMEM wrapper. However, I am not a fan of adding the recursive mutexes because they will affect everyone including those running Vanetza single-threaded.
My usual pattern when integrating Vanetza in a multi-threaded application: All Vanetza entities (including security, DCC, access interface etc.) are running on a single thread and thread-safe queues are used for sharing incoming/outgoing packets with other application code potentially running on other threads.
If you have an idea for another (optional) synchronization mechanism, please create a separate pull request. Thanks!

[buraksenkus]

Actually those commits shouldn't be in this branch, they were added by mistake. We're working on multi-thread operations in another branch and they are not related with this PR. Sorry for the mistake. I'll fix the PR

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[buraksenkus]

Now this is the intended PR :)

[riebl]

Merged as 361409c