`sign` should accept string as hex string or sg_encoded string, not as a raw data

[davidyuk]

aepp-sdk-js/src/utils/crypto.ts

Lines 141 to 143 in de98710

	export function sign(data: string | Uint8Array, privateKey: string | Uint8Array): Uint8Array {
	return nacl.sign.detached(Buffer.from(data), Buffer.from(privateKey));
	}