feat: add several fields to manage state of database encryption update (#1243)

* feat: add several fields to manage state of database encryption update

PiperOrigin-RevId: 619289281

Source-Link: https://github.com/googleapis/googleapis/commit/3a7c33486ca758b180c6d11dd4705fa9a22e8576

Source-Link: https://github.com/googleapis/googleapis-gen/commit/6a8c733062d833d11c5245eda50f5108e0e55324
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