Convert Sample Space dict to Named Tuples

[adamzev]

The way the sample space is coded awkwardly encodes object like data as a string.

Here's what it looks like:

        self.sample_space = {
            'Walk: Base on balls': base_on_balls / outcomes,
            'Walk: Hit by pitch': stats['hbp'] / outcomes,
            'Walk: Intentional Walk': stats["ibb"] / outcomes,
            'Out: SO': stats["so"] / outcomes,

This needs to be coverted to named tuples. Something like ("Result Type", "Result Details", "Probability") and the code that uses it needs to be adjusted.