Allow tuning of policy-server deployment

[flavio]

Right now the policy-server deployment has hard-coded values that cannot be changed by the user.

We should allow the users to tune these aspects of policy-server:

• [x] https://github.com/kubewarden/kubewarden-controller/issues/42
• [x] https://github.com/kubewarden/kubewarden-controller/issues/41
• [x] #103
• [x] https://github.com/kubewarden/kubewarden-controller/issues/43
• [x] #104
• [x] https://github.com/kubewarden/kubewarden-controller/issues/45

[flavio]

This is currently blocked by the cards about the new architecture

[ereslibre]

This is done 👏