Improve signTypedData return type

[avarobinson]

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[REQUIRED] Describe the problem

The return type of signTypedData is a Promise<Hash>, where Hash is the type defined by viem. https://accountkit.alchemy.com/packages/aa-accounts/light-account/signTypedData#promisehash

Naming wise, this is misleading, because the return value is actually the signature itself, not the hash that is being signed over. A better return type would be Hex. Technically both Hash and Hex are implemented as the template literal type 0x{string} , but their naming carries additional connotation.

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