[Nestjs] Instrument Controllers

[nicohrubec]

I noticed that we do not have any tracing for nest controllers atm. I'd assume that many people use nest as a REST service, in which case controllers are the entry points for any incoming requests.

Solution Brainstorm:

• All controllers have a @Controller decorator. Individual endpoints also have annotations for the request type (e.g. @Get).
• We can hook into one of these annotations as we for instance already do for the @Injectable decorator.
• We need to check if all annotations are actually required or if users can omit them (for instance if we omit the request type annotation it might default to a GET endpoint).

[linear]

JS-1295