Add querrystring parser

[ivan-tymoshenko]

We are already searching the querystring in the path and are spending some time on it. I want to pass the querystring to the handler instead of parsing it again in the handler. The querystring would be passed to the handler as a new argument.

+ find-my-way handle ';' as a querystring start symbol and fastify doesn't.

The changes to the fastify:
ivan-tymoshenko/fastify@00087f0

Benchmarks:
In the main branch, I added a handler that parses querystring in the same way as fastify does
(https://github.com/fastify/fastify/blob/0a4649f504bd466ce7dd37b510832746b213b2d4/lib/route.js#L377) and compared it with parsing a querystring natively in the find-my-way.

Handler in the main branch:

  findMyWay.on(method, url, (req) => {
    const queryPrefix = req.url.indexOf('?')
    const query = querystring.parse(queryPrefix > -1 ? req.url.slice(queryPrefix + 1) : '')
    return query
  })

[mcollina]

lgtm

[mcollina]

could you update the docs?

[mcollina]

lgtm

[mcollina]

Can you fix the conflicts?

[mcollina]

Can you fix the conflicts (sorry)?

[Uzlopak]

Wow