Add ERC6492 signature validation

[ernestognw]

Fixes #????

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[ernestognw]

I started experimenting with this but I realized we might need 4 different variants (and maybe that's too much):

• A function that allows side effects and that it's reentrant
• A function that reverts after verifying the signature and returning the validation result as the revert reason
• A variant of each one for calldata

For the one that reverts, I think it may be useful to add a relayer contract that reverts with the result in the RelayedCall library.