[CLI] Faucet Refactor and Command Enhancement

[jolestar]

Summary

This pull request introduces a comprehensive refactor of the Faucet functionality and enhances the CLI for better usability and maintenance.

1. Renamed gas_airdrop to gas_faucet for clarity.
2. Refactored the Faucet implementation to call gas_faucet contract to claim RGas.
3. Integrated the Faucet as a sub-command within the rooch CLI, accessible via rooch faucet server.
4. Set the default port for the Faucet to 6868 for consistency.

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Name	Status	Preview	Comments	Updated (UTC)
rooch-portal-v2.1	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 28, 2024 8:11pm

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
rooch	⬜️ Ignored (Inspect)			Sep 28, 2024 8:11pm

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

OpenSSF Scorecard

Package	Version	Score	Details

Scanned Manifest Files

[wow-sven]

后面测试网也需要utxo 才能领取gas了吗

[jolestar]

后面测试网也需要utxo 才能领取gas了吗

合约里有设置，默认不需要。