verifier should be a property of validation_method and verification_method

Currently verifier is a property of the evidence, however this assumes that there is only one verifier used for each bit of evidence yet it is entirely possible for there to be 2 verifiers involved, one to validate the evidence and one to verifier the user is the person the evidence relates too, in fact there might be 2 just for this if they use different providers for liveness and likeness. For example an OP may use a 3rd party provider to check the authenticity of a document and a different provider to do the biometric match of the user to it.

To resolve this verifier should be a property of validation_method and verification_method, it may need some further properties in order to explain what they did.

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