[glutton-westend] and add sudo key to genesis config (#7794)

I discovered in https://github.com/paritytech/polkadot-sdk/pull/7459,
that the overhead benchmark is not working for glutton-westend, as the
client can't send `system.remark` extrinsics. This was due to 2 issues:

1. Alice was not set as sudo. Hence, the `CheckOnlySudoAccount` deemed
the extrinsic as invalid.
2. The `CheckNonce` TxExtension also marked the extrinsic as invalid, as
the account doesn't exist (because glutton has no balances pallet).

This PR fixes the 1.) for now. I wanted to simply remove the
`CheckNonce` in the TxExtension to fix 2., but it turns out that this is
not possible, as the tx-pool needs the nonce tag to identify the
transaction. https://github.com/paritytech/polkadot-sdk/pull/6884 will
fix sending extrinsics on glutton.

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Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: s0me0ne-unkn0wn <48632512+s0me0ne-unkn0wn@users.noreply.github.com>