[Feature] Arangosync v2

[informalict]

Description:

• Automatic recognition of the arangosync custom image.
• run arangosync worker as a sidecar when all requirements are fulfilled.

Tests: https://github.com/arangodb/kube-arangodb/pull/861#issue-1080919393

Design doc: https://github.com/arangodb/kube-arangodb-release-manager/blob/master/documentation/arangosync_worker_sidecar.md