feat: added custom headers to explorer request

[ignaciosantise]

Summary

added custom headers to explorer list request

Solves

https://github.com/WalletConnect/web3modal-react-native/issues/52

[github-actions[bot]]

🚀 Expo preview is ready!

• Project → web3modal-rn-example
• Platforms → android, ios
• Scheme → rnweb3modalexpo
• Runtime Version → exposdk:48.0.0
• More info

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