Rewrite of reconcilers and `v1beta2` API introduction

[hiddeco]

This is a wrapping issue to provide an overview of the PRs we want to be included in the next minor release range (v0.22.x), completing the overall rewrite of the reconcilers and introduction of the v1beta2 API.

List is in sequential order, and may be incomplete at time of creating this issue:

• Move to v1beta2 API and rewrite reconcilers #586
• Implement Size field on archived artifacts #597
• Introduce BucketProvider interface #596
• Add native Azure Blob support #598
• API v1beta2 spec docs #599