feat: migrate to picoquery

[43081j]

Migrates from qs to picoquery, a much faster library.

We can't use URLSearchParams since we support nested syntax (and therefore assert on the top level property)

[keithamus]

Is pq drop in? Should we release as major to be safe? Not a suggestion, I’m fine either way just curious.

[43081j]

qs has a pretty awkward/messy support for mixed syntax. i think it probably makes sense to bump major because of that

for example, stuff like foo.bar[baz][0] probably works in qs but is nonsense. it should be one syntax or the other, not a mixture (e.g. foo.bar.baz[0], or foo[bar][baz][0] but not both)

we should probably decide which syntax we want to support

picoquery has 3:

• js (foo.bar[0])
• dot (foo.bar.0)
• index (foo[bar][0])

we should probably set it to js i think, though the tests right now assert against the index-style syntax