Add metaMask connector

[shahbaz17]

Note

Adds MetaMask connector usage to the Wagmi connect-wallet guide with config and UI example.

• Docs (connect wallet guide)
  • Wagmi config (docs/get-started/how-to/connect-wallet.mdx):
    • Add metaMask connector alongside injected in createConfig connectors.
    • Include infuraAPIKey option in metaMask setup.
  • Example component:
    • Update ConnectButton to import metaMask and add a "Connect MetaMask wallet" button using useConnect.

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[shahbaz17]

Include in #1283