Kraken benchmarks

[maximecb]

The Kraken benchmarks need to be tested on Higgs. For the benchmarks that do not yet work properly, the cause of the issue needs to be identifier (is it a bug, is Higgs missing a required feature?). In the case of bugs, regression tests should be written and new issues should be filed so that these bugs can be fixed.

Please note that the Kraken benchmarks are already included in the Higgs repository.