share: EDSStore.Has

[Wondertan]

Context

To check if EDSStore keeps an EDS Has method is introduced.

Implemenation Details

Internally it:

• Converts DataRoot's hash into the shard.Key
• Checks if GetShardInfo does not return
  ErrShardUnknown

// Has checks if EDS exists by the given DataRoot.
func (s *EDSStore) Has(context.Context, DataRoot) (bool, error)