Improve Client observability

[RobertCraigie]

Problem

Debugging performance problems can be quite hard, especially due to the Rust black box that Prisma is. We should be able to provide some form of tracing to help users out.

Suggested solution

Unclear at the moment, would probably build on top of https://github.com/prisma/prisma/issues/9601 / https://github.com/prisma/client-planning/issues/21