[DONE] External auth feature

[sscarduzio (Simone Scarduzio)]

Amazing! I got @coutoPL to reveal his plans
As we discussed with @diegonc, rules ordering has become very sensitive nowadays.

See discussion:

What's the design around rule ordering

Hello Today I was debugging ROR plugin and noticed that the rules in one of the blocks I’ve configured were not executed in the order I expected. Then I realised there’s is no user defined order as a block is just a YAML map and well maps are usually not ordered So, I was curious about what was the design decision here. Most of the rules don’t actually care as they work independently but indices_rewrite and indices could have ordering implications. Like filtering based on u…

We could either:

• Define a hard coded well-reasoned ordering + dependency system (easier UX, similar to today)
• Or let the users carefully pick what goes first (more powerful, more tricky, requires breaking changes to YAML structure)