feat(github): make less GitHub API calls

[orhun]

Description

This PR aims to improve the GitHub integration by sending less requests to the REST API. For that, I used the additional date parameters since and until to scope the request to a specific time frame.

However, this means that you won't be able to use the is_first_time field on the contributor since it requires the whole history to find out if the user has contributed before.

Motivation and Context

See #422

How Has This Been Tested?

Not tested yet.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[orhun]

closing for now, I might come back to this in the future if this becomes a bigger issue