Synchronize the Nibiru EVM Chain IDs with appconst.go for mainnet and testnet

[Unique-Divine]

The Ask

Ethereum-based clients need to reflect the following EIP-155 chain IDs for Nibiru.

var knownEthChainIDMap = map[string]int64{
	"cataclysm-1": 6900,
	"nibiru-testnet-1": 6910,
        // ... 
}

• Finish merging necessary pull requests in ethereum-lists/chains | In-progress and being completed by @cgilbe27
• Add information on this to the Nibiru docs
• Upload the related Metamask and Coinbase Wallet guides for custom networks

Resources

1. Nibiru-related pull requests in the ethereum-lists/chains repo
2. Nibiru/app/appconst/appconst.go: Ground truth for Nibiru Chain IDs
3. EIP-155 Specification