Adds StatefulSet support

[guillem-riera]

• Adds StatefulSet support
• Adds config autogeneration
• Adds a bit of documentation on the different configuration modes for multiple replicas

[guillem-riera]

First of all, thanks @thomiceli for your awesome work!

This week I decided to add StatefulSet support (which was a preference of our team) and I thought I could contribute this small feature back.

I hope I understood the nuances of the multiple-replica setup.