RocketPy

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

Exporting rocketpy classes to a json file is something that the user currently cannot do so easily. The get_instance_attributes (see below) function already made an important advance to export all the attributes of an instance to a dictionary, but that doesn't mean we can always save these dictionaries to json files.

Exporting objects as json files might be the easiest way of saving a rocketpy simulation without having to plot tons of data and plots.

https://github.com/RocketPy-Team/RocketPy/blob/14dd0f6bb263c82eb8f137847b0480288e500743/rocketpy/utilities.py#L642

Describe the solution you'd like

• Add to_json, to_serializable or __json__ methods to the important classes of RocketPy, allowing the
• Alternatively, the jsonpickle package can be used to perform a quick encode/decode with any of the rocketpy classes, as already done in the EnvironmentAnalysis class. https://github.com/RocketPy-Team/RocketPy/blob/14dd0f6bb263c82eb8f137847b0480288e500743/rocketpy/environment/environment_analysis.py#L2899

Additional context

As far as I know there's no convention on Python regarding the name of the method