[Drift Detection] Adding handler action for DbInstance and DbCluster.

[gabrixdu]

Adding Handler Action for DbInstance and DbCluster status in order to differentiate between CREATE and UPDATE resource state.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[khebul]

Approved. Nit: other resources would benefit from the same logging enhancements.

[gabrixdu]

Sadly, only DbInstance and DbCluster support drift detection. Will add this in future PR.