[FEAT]: support organization level custom_property resource and custom_properties datasource

[venkatesh-thatham]

Describe the need

Custom properties are defined on an organizational level, and then applied on a repository level. Not all repositories may require custom properties, but, on the other hand some of the custom properties which defined in organization level may marked as required that need to be provided by every repository.

SDK Version

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API Version

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Code of Conduct

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[dlaguerta]

I believe this PR should address this request, and many folks have been waiting for it to merge: #2356

[venkatesh-thatham]

@dlaguerta I think the PR that you linked covers github_organization_ruleset. But what I was requesting is to provide github_organization_custom_property as like github_repository_custom_property. Kindly correct me if I'm wrong.

[netflash]

I would like to expand this request, if possible, not only to support organizational configuration but also to support enterprise-level organizations.
In an enterprise, this is under
https://github.com/enterprises/YOUR_ENTERPRISE_NAME/settings/custom-properties