Resolve some pending `Any` types

[kallewesterling]

Currently, there is little type control in the setting up of classes, and reading in files.

Suggested solution

Implement better type control. Here are som examples:

• [ ] BayesianNetwork.__init__: modeldata should be in json dict format can be checked and throwing an error if not correct
• [ ] BayesianNetwork.__init__: else statement (if not passed as string) does not mean passed as graph skeleton
• [ ] loadDataFromCSV function reads in the headers but then also reads them in again when the rest of the data is read in. The headers are then converted to floats along with the rest of the data. This may cause errors if headers are not numbers.

[kallewesterling]

I have created a number of these in the codebase now.

The remaining issue here are some remaining Any types, where I wasn't able to determine what the type should be. Downgrading the estimate for this issue consequently.