Sepiida

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Add user information even on whitelisted endpoints

Also build user URI more correctly and thoroughly in user fixture

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Add new environment variable, SEPIIDA_JWT_AUD which allows individual projects to set their JWT audience when using sepiida's built-in support for JWT decoding and validation

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Fix endpoint registration logic to prefer the passed-in endpoint name over the class name

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Add user emails to current user from session

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I've added a new class to sepiida.responses: ResourceList. This allows for specifying the total count for the resource list. Now the EnvelopeField will use the information
in that property to indicate the total count in the metadata of the resource list. If we don't know the count because the client code doesn't specify it then we just provide None/null, which is appropriate