optionally configure service account impersonation #398
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Note: this replaces open-telemetry/opentelemetry-collector-contrib#10173 per a suggestion from @dashpole.
GCP supports authentication using short-lived credentials obtained by
"impersonating" a service account. This is useful for cross-project
access, for example: a service account in one project is trusted to
impersonate a service account in another project and export metrics on
its behalf. This patch adds support for service account impersonation
for metrics, logs, and traces.
See https://cloud.google.com/iam/docs/impersonating-service-accounts for
details.