feat(core): Add setViewport for custom coordinate mapping (Closes #7959)

[ombalgude]

Hi @davepagurek! Thanks again for the detailed feedback. This new pull request addresses the comments from the previous attempt in PR #8102.

Closes #7959

Changes:

• This PR introduces the setViewport(xmin, xmax, ymin, ymax) function, which allows users to define a custom, resolution-independent coordinate system. This makes it easier to create responsive and scalable sketches.

Addressing Feedback from PR #8102:

• Targets dev-2.0: This PR is now correctly based on and targets the dev-2.0 branch for the upcoming p5.js 2.0 release.
• Uses Addon Structure: The function has been implemented using the new defineAddon structure required for p5.js v2.
• Includes Visual Tests: I have added a new visual test to ensure the feature renders correctly and to prevent future regressions.

PR Checklist

• npm run lint passes
• Inline reference is included / updated
• Visual tests are included / updated

[ombalgude]

Hi @davepagurek @limzykenneth and @perminder-17

I just wanted to check in on this PR and see if there's anything I can do to help move it forward.

I'm happy to answer any questions or address any feedback. Thanks!

[perminder-17]

Hi and really sorry for the delay in reviewing your PR.

Do you think we should keep this funciton as an add-on library as @limzykenneth said? https://beta.p5js.org/contribute/creating_libraries/

I think it can be implemented as an addon library first, if not just to test out the idea itself and work out the desired API in a more flexible way.