Add support for tracking commits pushed to branch (Forked)

[rajku-dev]

Fixes #373
2nd Part of #601

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[rajku-dev]

In the implemented approach, following algo is followed

1. Fetch all members of organization
2. Fetch all repos of organization
3. Fetch all open PRs of each repository
4. Filter the PRs whose author is not a member & not blacklisted
5. Fetch all commits (excluding merge commit) through REST API
6. Add the user

I ran the scrapers, and they ran perfectly fine.
Used a combination of GraphQL and REST to optimize the rate limits, i.e., 5000 points/hour for GraphQL and 5000 requests/hour for REST.

@rithviknishad if these changes are applicable or need any changes please let me know
I will move ahead with implementing the types.

[rajku-dev]

Local data-repo after running scraper