orb DID Method Files

This release addresses a number of scalability and performance issues.

What's Changed

• fix: Stop monitoring anchor once witness list is exhausted by @bstasyszyn in https://github.com/trustbloc/orb/pull/1561
• fix: Ensure parent anchor is processed only once by @bstasyszyn in https://github.com/trustbloc/orb/pull/1564
• fix: Set expiryTime field on detached operation by @bstasyszyn in https://github.com/trustbloc/orb/pull/1568
• fix: Don't process anchor if it has already been processed by @bstasyszyn in https://github.com/trustbloc/orb/pull/1566
• fix: Exit proof monitor loop on server shutdown by @bstasyszyn in https://github.com/trustbloc/orb/pull/1571
• fix: Delete pending anchor link references when failed to publish to queue by @bstasyszyn in https://github.com/trustbloc/orb/pull/1574
• fix: Exit anchor status monitoring loop on shutdown by @bstasyszyn in https://github.com/trustbloc/orb/pull/1575
• chore: Update BDD tests to latest VCT version by @bstasyszyn in https://github.com/trustbloc/orb/pull/1576
• fix: Add support for DID as an alternate source by @bstasyszyn in https://github.com/trustbloc/orb/pull/1578
• fix: Failed processing of batch can cause operation queue to grow uncontrollably by @bstasyszyn in https://github.com/trustbloc/orb/pull/1580
• chore: Add function GetEndpointNoCache by @bstasyszyn in https://github.com/trustbloc/orb/pull/1581

Full Changelog: https://github.com/trustbloc/orb/compare/v1.0.0-rc6...v1.0.0-rc7