Replace assert statements with more informative errors.

[Ianlmgoddard]

To validate the user inputs to the sbr calculations we call assert to check if the user has provided inputs of the correct type -

smart-building-rating-calculator/src/smart_building_rating_calculator/initiate_user_inputs.py

Line 66 in c709491

assert isinstance(smart_ev_charger, bool)

.

I don't think this is recommended and we should be using either [TypeError](https://docs.python.org/3/library/exceptions.html#TypeError. ) or ValueError. This is more informative for users of the package as it clearly tells the user that they have a problem with their inputs.