tests: bsim_bt: Add EDTT based BT stack tests

Add some scripts to automatically run a set of BT conformance tests.
Each script has an associated file which selects which subset of tests
are run by that script.
The LL scripts are divided in 2 subsets so as to allow parallelizing
a bit the run (the LL tests take the longest).
Except these, all other sets are just divided by category.

Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>