Add snapshot sync controller

[alexander-demicev]

What this PR does / why we need it:

Add snapshot sync controller, I will add tests in a follow-up PR

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes https://github.com/rancher/turtles/issues/501

Special notes for your reviewer:

Checklist:

• [ ] squashed commits into logical changes
• [ ] includes documentation
• [ ] adds unit tests
• [ ] adds or updates e2e tests