Dataset RPC with ID (#29)

* init branch

* CoFail cases compiles

* trying to add ID into dataset protocol WIP

* `Datasets` class with cached DatasetStorage's

* tests compiles

* license header

src/main/scala/fluence/crypto/hash/CryptoHasher.scala

@@ -18,6 +18,7 @@
 package fluence.crypto.hash
 
 /**
+ * TODO add F[_] effect
  * Base interface for hashing.
  * @tparam M type of message for hashing
  * @tparam H type of hashed message