Fix public key response

• VerificationMethod must always have "controller" attribute
• PublicKeyJWK is renamed to PublicKeyJwk

@yordan.kinkov @valerii.kalashnikov

added DevCompleted Need review labels

requested review from @yordan.kinkov

assigned to @lyuben.penkovski

mentioned in commit 57096af6

merged

mentioned in commit 1d795d4c