FEATURE: Enable cargo features to create a simplified version of Mesa

[Masber]

This is issue is related to Mesa extensibility, we would like in the future to create applications in Python and Go using Mesa as a library.
On the other hand we will migrate Manta code into Mesa and this may make the library more convoluted, specially for others wanting to use it.
A solution to this is to introduce cargo features to Mesa, the goal is to be able to provide a minimal product with very basic functionalities and on top of that provide features to extend it.