Added photosphere_scale param to RPacketPlotter plot

[MariamH78]

📝 Description

Type: 🪲 bugfix

closes #2116 .
I was advised to open a PR here as well so that my modifications can be reviewed by the visualization team, so I'll just copy the content of my PR on jayant's repository.

I added a few functions to the main file, please review them because at some point I confused myself with the math. [I later reviewed the math I used to scale the points' coordinates and I think it's okay, but a second opinion is still needed.]

I added a grid parameter as well, since it makes it easier to view how non-linear the grid is. (It's important to note that I never quite figured out how to configure the scales for the axes correctly, so the values on the axes are approximations at best. Maybe delete the grid_on param since it highlights this flaw? Users should rely on the hovertext values instead, but I also want to somehow highlight the non-linearity of the scale: maybe have a small printed message stating that the axes' scale is not linear if the photosphere_scale is set to anything but 1, and avoid gridlines altogether?)

I updated the docs' notebook as well.

📌 Resources

🚦 Testing

How did you test these changes?

• Testing pipeline
• Other method (Ran it in a notebook with varying values for photosphere_scale and grid_on)
• My changes can't be tested (explain why)

☑️ Checklist

• I requested two reviewers for this pull request
• I updated the documentation according to my changes
• I built the documentation by applying the build_docs label

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[jamesgillanders]

Closing this for now. If you are still interested in this PR, please let us know, and we can meet to discuss a slightly different implementation

[MariamH78]

A bit late, but I would love to hear your feedback and learn more about what would be changed.
Definitely interested in working on it.