feat(kuma-cp): universal resources schema validation

[slonka]

closes #5037

Checklist prior to review

• Link to docs PR or issue -- should I mention this here: https://kuma.io/docs/1.8.x/reference/http-api/#http-api?
• Link to UI issue or PR -- not ui issue
• Is the issue worked on linked? -- yes
• The PR does not hardcode values that might break projects that depend on kuma (e.g. "kumahq" as a image registry) --
• The PR will work for both Linux and Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS --
• Unit Tests --
• E2E Tests --
• Manual Universal Tests --
• Manual Kubernetes Tests -- not a k8s feature
• Do you need to update UPGRADE.md? -- no
• Does it need to be backported according to the backporting policy? -- no
• Do you need to explicitly set a > Changelog: entry here or add a ci/ label to run fewer/more tests? no

[slonka]

I hit dependency cycle a couple of times while developing this. I have a feeling that our package structure is a bit off. We have validation in multiple places. I'll try to figure out if we can make the structure a bit more straightforward.

[lobkovilya]

Nice work!

[slonka]

@lobkovilya @jakubdyszkiewicz - because of this being called on all policies I had to manually fix the fixtures. Right now every test case has a passing config.