[FEAT]: Add `github_client_config` data source

[jaredfholgate]

Describe the need

Per other providers it would be very useful to have context about the provider configuration. In particular it is currently impossible to get the owner attribute of the provider if it was set by env var. Getting the current username would also be useful for some scenarios.

SDK Version

No response

API Version

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Relevant log output

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

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