Highlight GLIDE asynchronous capabilities and how to take advantage of it

[Aryex]

GLIDE's architecture allows it to handle large amount of concurrency while making use of few threads. However we have noticed that users are not taking advantage of this and are often time creating blocking implementation or spawning many threads.

We need to improve the doc to highlight this capabilities. This may involve:

• Creating new docs on this topics.
• Updating existing docs to hight to users of our feature.