Collect all resources in cluster collector

[stepanstipl]

Currently, when adding/updating new resources, changes have to be made at two places, in-sync - the rego rules, and cluster collector. This is difficult to keep in sync. Also, the specific API versions hardcoded in cluster collector are expected to cause issues when running against a cluster that does not support these.

I see 3 options to move forward:
a) Collect all resources, in all API versions
b) Collect specific resource, in all API versions
c) Come up with a better/automated mechanism that wouldn't require editing things at two places. Potentially connected with #154 - consider coming with some format to describe rule metadata, incl. what resources are we interested in.