Commits on Jul 9, 2021

1. feat: define google.auth.downscoped.Credentials class …

   This is based on [Downscoping with Credential Access Boundaries](https://cloud.google.com/iam/docs/downscoping-short-lived-credentials).
   The new credentials are initialized mainly using elevated source
   credentials and a `google.auth.downscoped.CredentialAccessBoundary`
   instance.
   The credentials will then get access tokens from the source
   credentials and exchange them via the GCP STS token exchange
   endpoint using the provided credentials access boundary rules
   for downscoped access tokens.
   
   The new credentials will inherit the source credentials' scopes
   but the scopes are not exposed as we cannot always determine the
   scopes form the source credentials.

   

   bojeil-google committed Jul 9, 2021
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2. Fixes typos in comments.

   

   bojeil-google committed Jul 9, 2021
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3. Addresses review comments.

   

   bojeil-google committed Jul 9, 2021
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4. Moves all constants in the test file to module scope.

   

   bojeil-google committed Jul 9, 2021
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