Adjust MarshalSubjectAltName to allow SANs to be critical #367
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For both AKs and EKs the Subject Alt Name extension may be critical, or non-critical, based on the presence of the subject field.
So we need to expose control over this criticality to the caller, as detailed more in #366 .
This PR adds a new method MarshalSubjectAltNameWithCriticality that accepts a bool to control the criticality. The existing method (MarshalSubjectAltName) that specifies the extension non-critical is left untouched to maintain compatibility.