Replace qs in openapi-backend

[43081j]

Usage here:
https://github.com/openapistack/openapi-backend/blob/43d4e0d80c8cd3358576c5e8576a1900ec238005/src/router.ts#L332

we can achieve the same via picoquery:

import {parse} from 'picoquery';

parse(str, {
  valueDeserializer: (val) => {
    if (val.includes(',')) {
      return val.split(',');
    }
    return val;
  }
});

[Jayllyz]

It works with 0 code changes if you use neoqs

import { parse as parseQuery } from 'neoqs/legacy';

# neoqs added and qs removed
Estimated new statistics:
  Package size: 4.7 MB → 4.2 MB (88.30%)
  Subdependencies: 34 → 20 (-14)
  Traffic with last week's downloads:
    For current version: 78 GB → 69 GB (9.1 GB saved)
    For all versions: 203 GB → 180 GB (24 GB saved)

@types/qs is not in the estimated traffic change

I can send a PR unless we prefer picoquery (which is ok, no worries).

[43081j]

we've generally been following this strategy (in order):

• If possible use URLSearchParams rather than a dependency
• Otherwise, presumably the repo needs nesting/arrays support, so use picoquery
• If the repo is deeply tied into some qs-specific behaviours, use neoqs

So we should try move them to pq first, as it is much faster. Only if it sends us down a rabbithole (too many changes), we'd then drop in neoqs or similar