feat: add support for custom emoji fonts

[nolanlawson]

Fixes #82

I really didn't ever intend to do this, but it seems like people want this functionality. And support for COLR fonts seems pretty good in modern browsers. So if folks want it, then let's add it.

[github-actions]

📊 Tachometer Benchmark Results

Summary

benchmark-total

• emoji-picker-element-database-interactions: unsure 🔍 -6% - +3% (-9.20ms - +4.89ms)
  ^{this-change vs tip-of-tree}
• emoji-picker-element-first-load: unsure 🔍 -6% - +10% (-4.00ms - +6.39ms)
  ^{this-change vs tip-of-tree}
• emoji-picker-element-second-load: unsure 🔍 -7% - +8% (-4.75ms - +5.18ms)
  ^{this-change vs tip-of-tree}

Results

emoji-picker-element-database-interactions

• Browser: chrome-headless 108.0.5359.98
• Sample size: 50
• Built by: Benchmarks #198

• Commit: d262296

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	151.49ms - 160.86ms	-	unsure 🔍 -6% - +3% -9.20ms - +4.89ms
tip-of-tree tip-of-tree	153.07ms - 163.59ms	unsure 🔍 -3% - +6% -4.89ms - +9.20ms	-

emoji-picker-element-first-load

• Browser: chrome-headless 108.0.5359.98
• Sample size: 60
• Built by: Benchmarks #198

• Commit: d262296

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	62.02ms - 69.28ms	-	unsure 🔍 -6% - +10% -4.00ms - +6.39ms
tip-of-tree tip-of-tree	60.74ms - 68.18ms	unsure 🔍 -10% - +6% -6.39ms - +4.00ms	-

emoji-picker-element-second-load

• Browser: chrome-headless 108.0.5359.98
• Sample size: 50
• Built by: Benchmarks #198

• Commit: d262296

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	64.62ms - 71.42ms	-	unsure 🔍 -7% - +8% -4.75ms - +5.18ms
tip-of-tree tip-of-tree	64.18ms - 71.42ms	unsure 🔍 -8% - +7% -5.18ms - +4.75ms	-

_{tachometer-reporter-action v2 for Benchmarks}

[github-actions]

Size Change: +399 B (+1%)

Total Size: 42.2 kB

Filename	Size	Change
./bundle.js	42.2 kB	+399 B (+1%)

_{compressed-size-action}

[nolanlawson]

Well, it looks like in Safari on Mac, the emoji are misaligned in some cases. It's still busted in Safari Technology Preview too.

I can't figure out what's going on here. It's only in Safari, and only with the custom font.

[nolanlawson]

I'm guessing this has something to do with older emoji and the variation selector: https://emojipedia.org/variation-selector-16/

[nolanlawson]

Filed a bug on Safari. Could not find a workaround for the life of me.

I also couldn't get the COLR font to work at all in Epiphany Browser on Linux (WebKit). So these are limitations of COLR fonts that I think we just have to acknowledge.

[nolanlawson]

Tachometer regression seems genuine based on chrome traces, let's bring back rIC.