[extension/googleclientauth] Support ID-token

[rinx]

Component(s)

extension/googleclientauth

Is your feature request related to a problem? Please describe.

To send telemetry to backend services behind Google's Cloud IAP or Cloud Run, I need an authentication extension that supports Google-signed ID token.

Describe the solution you'd like

Support ID-token type in Google Client Auth extension.

I've sent a PR to the repository. GoogleCloudPlatform/opentelemetry-operations-go#851
If it merged into the main branch and released, the feature will be available by updating the extension/googleclientauthextension/go.mod.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• extension/googleclientauth: @dashpole @damemi @aabmass @jsuereth @punya @psx95

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