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This PR adds API key support. Internal doc: go/gapic-api-key-support
(1) created a new credential class for API key. The credential adds API key to
x-goog-api-key
header.(2) The new ADC logic is:
GOOGLE_API_KEY
andGOOGLE_APPLICATION_CREDENTIALS
are set, raise an exceptionGOOGLE_API_KEY
is set then return an API key credential; otherwise use the existing ADC flow