feat(chains): add Fantom chain

[Kamikozz]

https://docs.fantom.foundation/tutorials/set-up-metamask

Network Name: Fantom Opera RPC Url: https://rpc.ftm.tools/ ChainID: 250 Symbol: FTM Block Explorer URL: https://ftmscan.com/

https://docs.fantom.foundation/tutorials/set-up-metamask-testnet

Network Name: Fantom testnet New RPC Url: https://rpc.testnet.fantom.network/ ChainID: 0xfa2 Symbol: FTM

[amaryfilo]

Greetings! Thank you @Kamikozz for your Pull Request and interest in this package.

---

Do you use addChains method? With this method you can add custom chains to your project. Use this example structure in your project to add method:

import { ConnectWallet } from '@amfi/connect-wallet';

const connectWallet = new ConnectWallet();
const chains = [
    {
      name: 'fantom',
      chainID: 250,
      hex: '0xfa',
    },
    {
      name: 'fantom-testnet',
      chainID: 4002,
      hex: '0xfa2',
    }
  ];

// Add chains
connectWallet.addChains(chains);
// Init connect
connectWallet.connect(provider, network, settings).then(
  (connected: boolean) => console.log('connect wallet: ', connected),
  (err: any) => console.log('connect wallet error: ', err)
);

[Kamikozz]

@amaryfilo Thanks for advice! I've used this method to extend the library's default chains. Works perfectly!