feat(classical-ml): add random forest algorithm

[sutt0n]

Adds the Classical ML algorithm:

• Random Forest (Classical ML #221)

[mjovanc]

Thanks for the contribution! If you want to do something else regarding this I would be happy if you could add an example to it in here: https://github.com/blackportal-ai/delta/tree/master/examples/classical_ml

[sutt0n]

Thanks for the contribution! If you want to do something else regarding this I would be happy if you could add an example to it in here: https://github.com/blackportal-ai/delta/tree/master/examples/classical_ml

I shall! I'll go ahead and work on the other classical ML algorithms, too.

[sutt0n]

@mjovanc I added an example here: #242