Default compatibility should be with CommonRLInterface

[ancorso]

The package was originally designed to work with a handful of POMDPs from the POMDPs.jl ecosystem. Now that it is more general, we should probably change the design so that it assumes a problem conforms to the CommonRLInterface and not an POMDP/MDP interface. We can easily construct a CommonRLInterface from the POMDP or MDP (thats effectively what is happening here:

Crux.jl/src/sampler.jl

Line 89 in 45a17ee

if sampler.mdp isa POMDP

).