Create graphql id datasources

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This merge request adds two new data sources, one for project and one for group, that allow users to retrieve unique identifiers for each of them based on either an ID or url-encoded path.

This allows us to more easily create resources in the future where the GraphQL API requires those resource identifiers as the primary method of interacting with the resource, since we can now tell users to use this data source as a bridge between the project/group resource and any graphQL based resource.