Tournament Interface

[vivekjoshy]

Is your feature request related to a problem? Please describe.
Creating models of tournaments is hard since you have to parse the data using another library (depending on the format) and then pass everything into rate and predict manually. It's a lot of effort to predict the entire outcome of say, "2022 FIFA World Cup" easily.

Describe the solution you'd like
it would be nice if there was a tournament class of some kind that allowed us to pass in rounds which themselves contained matches. Then using an exhaustive approach predict winners and move them along each bracket/round. Especially now that #74 has landed it would be easier to predict whole matches and in turn tournaments.

The classes should be customizable to allow our own logic. For instance, allow using the munkres algorithm and other such methods.

Describe alternatives you've considered
I don't know any other libraries that do this already.

[vivekjoshy]

New dependency solutions are now off the table.