WC: Approved Namespaces

[bh2smith]

Migrate the session approval code into here (so wallets using the library don't have to do it themselves). Not sure if this is the best idea, but at least for supported chains it would be better to have closer to the SUPPORTED_CHAINS constant:

    const approvedNamespaces = buildApprovedNamespaces({
      proposal: params,
      supportedNamespaces: {
        eip155: {
          chains: supportedChainIds.map((id) => `eip155:${id}`),
          methods: [
            "eth_accounts",
            "eth_requestAccounts",
            "eth_sendRawTransaction",
            "eth_sign",
            "eth_signTransaction",
            "eth_signTypedData",
            "eth_signTypedData_v3",
            "eth_signTypedData_v4",
            "eth_sendTransaction",
            "personal_sign",
            "wallet_switchEthereumChain",
            "wallet_addEthereumChain",
            "wallet_getPermissions",
            "wallet_requestPermissions",
            "wallet_registerOnboarding",
            "wallet_watchAsset",
            "wallet_scanQRCode",
            "wallet_sendCalls",
            "wallet_getCallsStatus",
            "wallet_showCallsStatus",
            "wallet_getCapabilities",
          ],
          events: [
            "chainChanged",
            "accountsChanged",
            "message",
            "disconnect",
            "connect",
          ],
          accounts: supportedChainIds.map(
            (id) => `eip155:${id}:${adapter.address}`
          ),
        },
      },
    });