feat(node-experimental): Add koa integration #10451
                
     Merged
            
            
          
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This should auto-instrument Koa performance. We still needs tests for this at some point. cc @timfish / @onurtemizkan
The main reason to add this is that we have docs for this on docs.sentry.com, and we need a way to properly replace/update them (and they currently rely a lot on
startTransaction()etc.) With this we can eventually just update this to use the default koa integration we provide.