Add Miri CI Job

[gierens]

Miri is an interpreter for Rust's intermediate representation and can detect
certain undefined behavior, like out-of-bounds accesses and use-after-frees
in unsafe blocks for example. This adds a CI job that runs the test suite
with Miri.

Note: the cli_tests are excluded for now because Miri cannot properly run
them right now.

[cafkafk]

This sounds cool, I think we should try it :)

The CI seems to be failing, after that's fixed I think this should be fine to merge.

[gierens]

That's pretty strange because it runs locally, und miri seems to be complaining that compilation fails, weird ... I'll have to look into this a little more