feat(svg): add native p5.svg experimental feature module and contributor docs - #9123

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11d5960a326750d5838078e36cf38b85af677262, actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

src/core/p5.Renderer.js:455:10: Function 'calculateOffset' is declared but never used.

src/friendly_errors/param_validator.js:559:7: Expected a `break` statement before `default`.

src/friendly_errors/param_validator.js:627:14: Catch parameter 'error' is caught but never used.

src/friendly_errors/param_validator.js:567:14: Variable '_null' is declared but never used.

src/io/csv.js:236:45: Unnecessary escape character '$'

src/io/csv.js:236:39: Unnecessary escape character '?'

src/io/csv.js:236:36: Unnecessary escape character '*'

src/io/csv.js:236:33: Unnecessary escape character '('

src/io/csv.js:236:30: Unnecessary escape character '{'