Start adding Mathematics of Array Demo

[saulshanabrook]

• Updates egglog to fix bug in functions Fix Incorrect Unstable Function Behavior egglog#739
• Starts addinging mathematics of arrays demo

[codspeed-hq]

CodSpeed Performance Report

Merging #380 will not alter performance

_{Comparing demo (be0b8a3) with main (b9f201c)¹}

Summary

✅ 14 untouched

Footnotes

1. No successful run was found on main (be0b8a3) during the generation of this report, so b9f201c was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩