Making requests processing prioritisation configurable

[jkyberneees]

restana prioritises HTTP requests processing by default using setImmediate, this default behavior allow us to reach bigger throughputs. However, under heavy load depending of how many other timers are used within your application workflows, using setImmediate might conflict with your requirements. From now on, this feature is configurable:

const service = require('restana')({
  prioRequestsProcessing: false
})

service.get('/hi', (req, res) => {
  res.send('Hello World!')
})
service.start()