Update Redbelly Testnet and Add Redbelly Mainnet

[Aastha9018]

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PR-Codex overview

This PR introduces changes to the redbellyTestnet and adds a new redbelly chain definition. It updates the block explorer details for the testnet and creates a mainnet configuration for the Redbelly Network.

Detailed summary

• Updated defineChain function signature in src/utils/chain/defineChain.ts.
• Changed block explorer details in src/chains/definitions/redbellyTestnet.ts (from Ethernal to Routescan).
• Added redbelly export in src/chains/index.ts.
• Created redbelly chain definition in src/chains/definitions/redbelly.ts.

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