Changes for 5ireChain mainnet and thunder testnet

[Ayushi5ire]

• Update RPC for thunder testnet.
• Add 5ireChain mainnet file

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PR-Codex overview

This PR introduces the fireChain definition for the 5ireChain, updates the thunderTestnet configuration, and modifies the exported modules in index.ts.

Detailed summary

• Added export for fireChain from ./definitions/5ireChain.js.
• Updated rpcUrls in thunderTestnet from https://rpc-testnet.5ire.network to https://rpc.testnet.5ire.network.
• Modified blockExplorers in thunderTestnet to change the name to 5ireChain Thunder Explorer and the URL to https://testnet.5irescan.io/.
• Defined fireChain in 5ireChain.ts with properties like id, name, nativeCurrency, rpcUrls, and blockExplorers.

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