feat: Penrose sound

[keenancrane]

Description

This PR adds a proof-of-concept for annotating Penrose diagrams with audio. Audio annotations are potentially useful for increasing the accessibility of diagrams for, e.g., the blind or partially sighted.

It also updates the renderer to specify the xmlns string as the first attribute in the global svg tag, which was needed to get the example to work. (It seems writing this attribute first is required for some browsers to provide the correct behavior for certain SVG features.)

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new ESLint warnings

Open questions

See README.md for some comments about features that would need to be supported in order to make sound a first-class entity in Penrose diagrams, namely, referencing external audio files (which is related to the ongoing question of how to reference external SVG files), and inserting the appropriate definitions at the top of the SVG.

[codecov]

Codecov Report

Merging #822 (2a05e6b) into main (514bfb6) will not change coverage.
The diff coverage is 0.00%.

❗ Current head 2a05e6b differs from pull request most recent head 48750be. Consider uploading reports for the commit 48750be to get more accurate results

@@           Coverage Diff           @@
##             main     #822   +/-   ##
=======================================
  Coverage   67.60%   67.60%           
=======================================
  Files          61       61           
  Lines        7669     7669           
  Branches     1384     1384           
=======================================
  Hits         5185     5185           
  Misses       2475     2475           
  Partials        9        9           

Impacted Files	Coverage Δ
packages/core/src/renderer/Renderer.ts	32.87% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 514bfb6...48750be. Read the comment docs.