BUG: Rail Buttons Not Accepted in Add Surfaces

[MateusStano]

In v1.6.0 rail buttons are no longer accepted in the add_surfaces method of the rocket class. This PR reintroduces this functionality as to avoid breaking changes

This was unfortunately something added in previous versions. Rail buttons do not behave like aerodynamic surfaces and should not be grouped together with them. A rocket can only have one set of rail buttons, this is why we have a set_rail_buttons and not a add_rail_buttons method.

Tests are passing locally

[Gui-FernandesBR]

The CHANGELOG needs to be updated!!! Is the develop branch already updated from master?

Please wait for the tests to be all checked.

We should pack a new release soon.

[Gui-FernandesBR]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 75.90%. Comparing base (b9b44dd) to head (4090d97).
Report is 16 commits behind head on develop.

Files with missing lines	Patch %	Lines
rocketpy/rocket/rocket.py	66.66%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #701      +/-   ##
===========================================
- Coverage    76.02%   75.90%   -0.13%     
===========================================
  Files           99       99              
  Lines        11278    11220      -58     
===========================================
- Hits          8574     8516      -58     
  Misses        2704     2704              

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