Add LoopNetwork Mainnet

[fengbaolong]

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PR-Codex overview

This PR introduces a new blockchain definition for LoopNetwork Mainnet by adding the loop export and its configuration in the codebase.

Detailed summary

• Added a new export for loop in src/chains/index.ts.
• Created loop.ts in src/chains/definitions/ with:
  • id: 15551
  • name: 'LoopNetwork Mainnet'
  • nativeCurrency: { name: 'LOOP', symbol: 'LOOP', decimals: 18 }
  • rpcUrls: { default: { http: ['https://api.mainnetloop.com'] } }
  • blockExplorers: { default: { name: 'LoopNetwork Blockchain Explorer', url: 'https://explorer.mainnetloop.com/' } }
  • testnet: false

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🦋 Changeset detected

Latest commit: 4d47c13

The changes in this PR will be included in the next version bump.

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