Add sybil checker Skill using Gitcoin passport and proof of humanity

[MrGtee1]

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Description

This skill helps check if a wallet is likely a sybil or a real human using two identity tools: Gitcoin passport and proof of humanity.

Type of Change

• [ ] Bugfix
• [ x] New Feature
• [ ] Improvement
• [ ] Documentation Update

Checklist

• [ x] I have read the contributing guidelines.
• [ x] I have added tests to cover my changes.
• [ x] All new and existing tests passed.

Related Issue

Closes #[issue number]