Update to use stellar-wallets-kit to support other wallets about soroban-example-dapp

[esteblock]

Great! Will check this to include it in paltalabs/soroban-react#11

[esteblock]

Currently, @soroban-react uses "connectors"
Each connector should be created first as a package @soroban-react/my-connector and then used like this:

...
import {futurenet, sandbox, standalone} from '@soroban-react/chains';
import {freighter} from '@soroban-react/freighter';
 ...   
const connectors: Connector[] = [freighter()];
                                           
  export default function ProviderExample({children}:{children: React.ReactNode}) {
    return (
      <SorobanReactProvider
        chains={chains}
        appName={"Example Stellar App"}
        connectors={connectors}>
          <SorobanEventsProvider>
          {children}
        </SorobanEventsProvider>
      </SorobanReactProvider>
    )
  }

A connector should just do:

export type Connector = {
  id: string;
  name: string;
  shortName?: string;
  iconUrl: string | (() => Promise<string>);
  iconBackground: string;
  installed?: boolean;
  downloadUrls?: {
    android?: string;
    ios?: string;
    browserExtension?: string;
    qrCode?: string;
  };
  isConnected: () => boolean;
  getNetworkDetails: () => Promise<NetworkDetails>;
  getPublicKey: () => Promise<string>;
  signTransaction: (xdr: string, opts?: { network?: string; networkPassphrase?: string; accountToSign?: string }) => Promise<string>;
};

[esteblock]

I see that Stellar-Wallet-Kit has a similar architecture:
https://github.com/Creit-Tech/Stellar-Wallets-Kit/tree/main/src/lib