Add automatic sanitizer tests

[tgorochowik]

Something like this would help us automatically find new memory leaks etc.

Some initial ideas:

• we should run only some small tests with the sanitizer enabled
• for example selecting the tests from sv-stests (that we know are green) could be a good first step
• this could run in a separate periodic job and publish some reports (does not have to be executed for each PR)

We could also use Valgrind or other tools.