Add Base Gillespie Algorithm

[Jamesflynn1]

• [x] Implement a base solver class that the application will use to run the model.
• [x] Code will need to call propensity and stoichiometry functions and update the compartment values.
• [x] Output will be the compartment values at each time step to console for now.

[Jamesflynn1]

Output to trajectory class, should output to a log and visual outputs eventually