feat: minislides can be displayed inline

[5p4k]

I was porting some Beamer theme to typst, and in the source theme I was using minislides, but the bullets were displayed right after the section title to save vertical space. I patched mini-slides locally, but I thought this feature might be interesting for other users too.

Here's the look I was after:

And here is how the dewdrop theme would look with inline: true, linebreaks: false:

I'm not very experienced with typst, so I'm looking for feedback on the change -- for example, I'm not convinced that two settings with similar name (linebreaks and inline) should exist for this, perhaps it should be better to have linebreaks be some sort of enum, like "always", "inline-subsections", "inline-all".

Let me know what you think and if this feature is interesting for touying.