feat: Public key store/cache for Observer #1262
Merged
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Implemented a public key storage and cache for the Observer. When verifying a witness proof, the Observer will load the public key of the signer from the cache/database. If it doesn't exist in the DB then the public key is retrieved using the public key fetcher.
Also enhanced the BDD test so that, when creating DIDs on multiple targets, the target will be greylisted if it is down and the create will be performed on another target.
closes #1261
Signed-off-by: Bob Stasyszyn Bob.Stasyszyn@securekey.com