[smio] Implement dynamic loading of SMIOs module

[lerwys]

Problem: Currently, we don't have a way of dynamic loading a new SMIO module. At each new SMIO, we need to recompile HALCS to include this new SMIO.

In fact, this should not be necessary nor desirable, as to improve decoupling of components.

Possible Solution: We can use a dlopen () approach to dynamic loading a new SMIO module as a dynamic library.