Export function to csv complete

[brunosorban]

Pull request type

Please check the type of change your PR introduces:

• Code base additions (bugfix, features)
• Code maintenance (refactoring, formatting, renaming, tests)
• ReadMe, Docs and GitHub maintenance
• Other (please describe):

Pull request checklist

Please check if your PR fulfills the following requirements, depending on the type of PR:

• ReadMe, Docs and GitHub maintenance:

  • Spelling has been verified
  • Code docs are working correctly

• Code base maintenance (refactoring, formatting, renaming):

  • Docs have been reviewed and added / updated if needed
  • Lint (black rocketpy) has passed locally and any fixes were made
  • All tests (pytest --runslow) have passed locally

• Code base additions (for bug fixes / features):

  • Tests for the changes have been added
  • Docs have been reviewed and added / updated if needed
  • Lint (black rocketpy) has passed locally and any fixes were made
  • All tests (pytest --runslow) have passed locally

What is the current behavior?

There is no function to export dispersion data to csv.

What is the new behavior?

A export function from dispersion results dictionary to a csv was added.

Does this introduce a breaking change?

• Yes
• No

Other information

Enter text here...

[Gui-FernandesBR]

Great simple addition by Brunao!! Thank you, man

However, I think this can be solved in a more complete way if we consider the new Dispersion class (not 100% sure on how to do that).

I would say to create another PR instead of moving forward with this one. @MateusStano your opinion is important here as well.

[MateusStano]

Done in PR #366