ENH: Save dispersion outputs in different file formats

[Gui-FernandesBR]

Is your feature request related to a problem? Please describe.

As suggested by @MateusStano at #229 .

Describe the solution you'd like

We should easily save the disrpersion outputs into an external file.
It is important when we have to simulate several rockets over different scenarios and perform a quick comparison.

[Gui-FernandesBR]

Perhaps they [the outputs from the Monte Carlo simlations] should be exported to ;json files instead of .txt (current) or .csv (proposed)