Evaluate the usage of uvloop in the content-app

[pedro-psb]

The uvloop library advertises itself as:

a fast, drop-in replacement of the built-in asyncio event loop. uvloop is implemented in Cython and uses libuv under the hood.

We could test if that works out-of-the-box and if we can see meaningful performance improvements (for example in the services deployment).

Look like its a matter of adding uvloop as a requirement and replacing aiohttp.GunicornWebWorker with aiohttp.GunicornUVLoopWebWorker in our Gunicorn application.