Add `inspect` command

[finsberg]

Add a new command that can take as input an .ode file, an print details about the ODE in the terminal.

For example, you should be able to run

python3 -m gotranx inspect file.ode

Which should give some basic information about the ODE
You could also add a command like

python3 -m gotranx inspect file.ode --list-states

which will list all the states with default values. You can use rich to get a nice output.

I have started a PR here: #24