Badges with deep endorsement trees fail validation

[ottonomy]

The validator doesn't ever know to stop validating endorsements of objects. So if there are lots of them, it takes a long time to make a request, and that request is likely to time out. There should be some limit to the amount of endorsements that are checked, and potentially more complex solutions that enable some checking of relevant endorsements but does not block verification of the key object.

Validation / verification of endorsements should not block validity of the core validation subject. Validity of those endorsements should be reported back by the validator separately and optionally.