Add bullets

[Enivex]

There are also some additional dingbats, but I avoided adding them both because naming is hard, they double as emojis, and it's not entirely clear whether they belong under bullet or not.

Closes #88

Blocked by #62 (unless I change .o to .circle)

[MDLC01]

U+2022 • BULLET (sym.bullet) has the Unicode informative alias "black small circle", but is not present in Typst as a variant of sym.circle. U+2219 ∙ BULLET OPERATOR (sym.bullet.op in this PR) has no Unicode informative alias, but is already present as sym.circle.filled.small.

Do you know what the point of bullet.hole is?

[Enivex]

U+2022 • BULLET (sym.bullet) has the Unicode informative alias "black small circle", but is not present in Typst as a variant of sym.circle. U+2219 ∙ BULLET OPERATOR (sym.bullet.op in this PR) has no Unicode informative alias, but is already present as sym.circle.filled.small.

We need to do an overhaul of geometric shapes at one point, but that's a much bigger project

Do you know what the point of bullet.hole is?

I believe it's just another alternative bullet for use in lists. Font support is pretty lacking though.

Edit: This is what it looks like in Noto Sans Symbols 2

It's official name is "inverse bullet"

[MDLC01]

Seeing as it seems to be used as list markers in some documents, let's keep bullet.hole.