Refactor: Move getNoiseShaderSnippet to strands backend

[LalitNarayanYadav]

Addresses #8670

Changes

Refactored getNoiseShaderSnippet to be part of the strands backend instead of individual renderers.

Key updates

• Added getNoiseShaderSnippet to:
  • strands_glslBackend
  • strands_wgslBackend
• Updated strands_api to use:

  strandsContext.backend.getNoiseShaderSnippet()
  

Changes

Removed duplicated implementations from:

• WebGL renderer
• WebGPU renderer
• 2D filter renderer

Reason

Previously, noise() shader support depended on renderer-specific implementations, leading to duplication and tighter coupling.

Moving this logic into the backend:

• centralizes shader utilities
• aligns with backend responsibilities
• improves consistency across renderers

Testing

• Build completes successfully with no errors
• Verified noise() works in shaders without renderer-specific dependencies

PR Checklist

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

[p5-bot]

Continuous Release

CDN link

• https://raw.esm.sh/pr/p5@5ede9ae/lib/p5.min.js

Published Packages

• https://pkg.pr.new/p5@5ede9ae

Commit hash: 10f180a

Previous deployments

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[davepagurek]

Looks great, thanks!