Add the support in sending the rule parameters and custom severity to the engine

[Bezbran]

We need to decide what to do in case of collisions between bindings.
For severity we can take the highest.
What should we do with the parameters? How to merge them?
@slashben

[slashben]

@Bezbran , it would be interesting to see how this problem was solved in the API server with Validating Admission Policies.

I think this is an "undefined" scenario for them. This means that they are not committing to specific behavior.

[Bezbran]

And what about network policies...

[Bezbran]

If we will decide we are dealing with only with while lists, I guess the best we can do is to accumulate the whiltelists per rule.

Just- the parameters is something I am not sure we can promise to be "while list"ish.

@slashben WDYT?