Allow multiple Trust Anchor values in resolve requests

[selfissued]

Fixes #130

[peppelinux]

I request to move the trust chain in the response as REQUIRED for consistency

It makes sense to have It by default

[selfissued]

I agree that it's more consistent to always include the trust_chain claim in the resolve response JWT.

[zachmann]

I want to open a discussion on whether the resolver "MAY return a successful resolve response using any one of the Trust Anchor values provided" (current text of the PR) or it SHOULD return the resolve response for the first Trust Anchor that resolves successfully.

I would argue for the later, since this gives guidance, but would still allow the resolver to do otherwise.

[peppelinux]

"First" might depend from the ordering of the trust anchors provided within the array, "Any" might mean that it is only up to the trust evaluator decide which trust anchor to use.

Any gives more freedom to the resolver in taking its choice, while "First" sounds like it would be the requestor in deciding the ordering of the trust anchor on the basis of the priority it decides