Addresses #6485 Refactor ellipse drawing logic in p5.Renderer2D.js

[tuminzee]

Addresses #6485

Changes:

Screenshots of the change:

PR Checklist

• npm run lint passes
• Inline documentation is included / updated
• Unit tests are included / updated

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[limzykenneth]

@tuminzee Basic manual tests I've done with the fork looks fine to me. Let me know if you are ready for this to be merged or you want to implement roundedRect here as well.

[tuminzee]

ellipse is ready to be merged, but I am still working on arc, rect
What do you recommend should be the approach? Should this PR be merged, and I should make different PR for individual functions?
or should I finish all of it in this PR

[tuminzee]

@GregStanton it is taking some time for me finish the other functions, should we merge this one function first, and I will complete the other functions later?

[GregStanton]

Hi @tuminzee! Sorry I missed your question before. Yeah, let's go ahead and merge this if you're okay with it. I just added a task list to #6485, so that others can start to work on the remaining two functions in separate pull requests. Does that work for you?

[limzykenneth]

Looks good. Thanks!