feat: add rei mainnet

[Zhangnong]

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PR-Codex overview

This PR adds support for the REI Mainnet to the codebase, including its chain definition and export.

Detailed summary

• Updated .changeset/cuddly-coins-carry.md to include a patch for REI Mainnet.
• Added export for rei in src/chains/index.ts.
• Created rei.ts in src/chains/definitions/ with the following details:
  • id: 47805
  • name: 'REI Mainnet'
  • nativeCurrency: 'REI' with 18 decimals
  • rpcUrls: HTTP and WebSocket endpoints
  • blockExplorers: REI Scan with a URL
  • Set testnet to false.

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