In some tests made on the testProxy function, the `new ProxyAgent()` was not working, even adding it the IP result was the same.
I've change it to the `new HttpsProxyAgent()` and it worked.
Refactored the proxy agent to center the same function/creation the same where it is used
When saving data from a group session (sender-key-xxxxx@g.us::xxxxx::xx) we receive the data param as an array.
In mongodb we can't save an array as a root document. Bacause this, in this case we save the array in a property called content_array.
