Print query parameters

[timsuchanek]

As of now, we only print the query when using

new PrismaClient({
  log: ['query']
})

We only print the sql query generated for the js queries. However, we should also print the parameters.

[timsuchanek]

As this might be a security concern, we first need to decide, if we want to expose the parameters by default.

[nikolasburk]

The docs needed here are for .on(...) (?), more info will be provided by @timsuchanek.

[timsuchanek]

You can find most of the necessary information here in the spec: https://github.com/prisma/specs/tree/master/prisma-client-js#logging

[nikolasburk]

Added docs for logging query parameters here: https://github.com/prisma/prisma2/blob/master/docs/prisma-client-js/api.md#logging-query-events