feat(policy): implement policy eval

[Piskoo]

Summary

Introduces a new chainloop policy eval command that evaluates policies using the control plane with organization settings, supporting both generic and material-based policy evaluation.

Differences

Feature	policy eval	policy develop eval
Authentication	Required	Optional
Allowed Hostnames	From org config	Manual --allowed-hostnames
Debug Mode	Not supported	Supported

[migmartri]

See inline comments, I am not sure why we need to move the evaluation server-side for this change cc/ @jiparis

[Piskoo]

is it possible that this PR contains too much information, including remote evaluations or smth like that?

Yes, this PR before was only about remote execution, the idea was to use server side execution as part of declarative control gates (which we decided to not implement). But remote execution was moved out of scope for this project so I cleaned up the PR. Now it contains only changes related to the new command. Sorry about that.