Simplify multidimensional generic tests

[elBoberido]

Brief feature description

With generic-tests it is currently not possible to have more than one dimension for generic tests, e.g. generate all combinations for Foo, Bar with u8, u16, u32, u64.

There is a issue on the generic-test repository -> https://github.com/mzabaluev/generic-tests/issues/7

We need to either

• wait till it will be implemented
• contribute to generic-test
• create an own custom solution