Feature/add mantra dukong evm testnet

[BigtoMantraDev]

Description

This PR adds the MANTRA EVM testnet as a testnet option using the following config:

export const mantraDuKongEVMTestnet: TypedEvmNetworkConfig = {
  id: 'mantra-dukong-evm-testnet',
  exportConstName: 'mantraDuKongEVMTestnet',
  name: 'Mantra DuKong EVM Testnet',
  ecosystem: 'evm',
  network: 'mantra-dukong',
  type: 'testnet',
  isTestnet: true,
  chainId: 5887,
  rpcUrl: viemMantraDuKongEVMTestnet.rpcUrls.default.http[0],
  explorerUrl: 'https://mantrascan.io/dukong',
  // MANTRA Chain is not using Etherscan, so leaving this blank for now.
  apiUrl: '',
  primaryExplorerApiIdentifier: '',
  supportsEtherscanV2: false,
  icon: 'mantra',
  nativeCurrency: {
    name: 'MANTRA',
    symbol: 'OM',
    decimals: 18,
  },
  viemChain: viemMantraDuKongEVMTestnet,
};

Related Issue

Motivation and Context

How Has This Been Tested?

1. Run locally
2. Select Mantra DuKong EVM Testnet
3. Input contract address
4. Input ABI
5. Select function
6. Connect wallet and execute the function

Screenshots:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.