Tf-operator: Acknowledge/credit contributors from other training operator repos

[terrytangyuan]

There are many contributors in other training operator repos that are not part of this repo's history. We should consider summarizing their contributions based on GitHub contributions graph for each individual repos.

@kubeflow/wg-training-leads

[Jeffwan]

@terrytangyuan Totally agree. Is there an easier way to do that? Do we need some tools to populate the contributions?

[terrytangyuan]

If there's a way to migrate those commits to this repo without affecting the project, it would be really great.

If not, we can just use GitHub API to summarize the contributions (number of commits, additions, and deletions, link to the list of commits, PRs reviewed, issue discussions involved, etc.). I had a tiny project that does something similar but it's in R and I haven't worked on it for a while. If others have any recommended tools, please comment here as well.