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Making credentials using fido_dev_make_cred: only one algorithm at a time supported #140

@yami36

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@yami36

Making credentials using fido_dev_make_cred.

The fido_cred_set_type funcion allows only one algorithm to be set.
The standard for pubKeyCredParams https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html#authenticatorMakeCredential allows multiple ones.

As we don't have an API to check if an authenticator supports a given algorithm, we are forced to set the algorithm to COSE_ES256

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    libfido2 2.0next iteration of the API

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