This commit renames the personalSign to Sign in nim and status-go to enable `eth_signTypedData_v4` signing.
The sing request coming from the status-go API contains the signing method to be used by the client. Currently we're supporting personal sign and signTypedData_v4.
The only difference between these two signing methods is the order of challenge and address in the `params` array. This is handled in the SappsConnectorSDK::buildSignRequest
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