Enum annotations missing in discovery and SDKs

[mikhailshilkov]

Hello!

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Issue details

Enum annotations are missing for some resources. Two examples that I recently found:

• apikeys.Key has a location property which can take any string. However, the discovery doc has a comment: Key is a global resource; hence the only supported value for location is "global"..
• eventarc.Trigger has an operator property which can take any string. However, the discovery doc has a comment: The only allowed value is "match-path-pattern"..

It would be nice if discovery docs had an annotation for these properties, and they would be respected in the SDKs.