[demo] add some benchmarks

[developit]

Probably worth extracting these into a proper set of benchmarks runnable in CI using proper statistics, but I figured I'd commit some stuff I had here.

Screen.Recording.2023-12-19.at.5.26.06.PM.mov

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[github-actions]

Size Change: +1.65 kB (+2%)

Total Size: 82.6 kB

Filename	Size	Change
docs/dist/assets/style.********.css	1.24 kB	+30 B (+2%)
docs/dist/demos-********.js	3.44 kB	+33 B (+1%)
docs/dist/assets/bench.********.js	1.58 kB	+1.58 kB (new file)	🆕

ℹ️ View Unchanged

Filename	Size
docs/dist/assets/client.********.js	46.3 kB
docs/dist/assets/index.********.js	1.07 kB
docs/dist/assets/jsxRuntime.module.********.js	281 B
docs/dist/assets/preact.module.********.js	4.02 kB
docs/dist/assets/signals-core.module.********.js	1.46 kB
docs/dist/assets/signals.module.********.js	2.02 kB
docs/dist/assets/style.********.js	21 B
docs/dist/basic-********.js	244 B
docs/dist/nesting-********.js	1.13 kB
docs/dist/react-********.js	242 B
packages/core/dist/signals-core.js	1.54 kB
packages/core/dist/signals-core.mjs	1.56 kB
packages/preact/dist/signals.js	1.27 kB
packages/preact/dist/signals.mjs	1.22 kB
packages/react-transform/dist/signals-*********.js	4.76 kB
packages/react-transform/dist/signals-transform.mjs	4 kB
packages/react-transform/dist/signals-transform.umd.js	4.87 kB
packages/react/dist/signals.js	189 B
packages/react/dist/signals.mjs	150 B

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