Optional ability to check if client has permissions to perform CRUD actions before trying them

**Describe the problem/challenge you have**
When reconciling an App and making changes to a cluster, kapp immediately tries to perform all the CRUD changes. If/when it encounters an error, it stops immediately. This can leave the content on the cluster in some intermediate or unknown state.

**Describe the solution you'd like**
Add an optional field to the App spec to allow the user to indicate they'd like kapp to check if the client (service account or cluster credentials) has permissions to perform every operation needed before executing any of them. If any of the checks fails, kapp makes no modifications to the cluster and returns an error.

**Anything else you would like to add:**
The SubjectAccessReview API can be used for these checks.

The related kapp issue is https://github.com/carvel-dev/kapp/issues/855.

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