Presto: Create Connector

[jornfranke]

Presto is a distributed SQL Query Engine for Big Data supporting a variety of sources. The idea is to add the hadoopcryptoledger library as a source to query directly blockchains, such as Bitcoin&Altcoins or Ethereum&Altcoins.
Currently, the hadoopcryptoledger library can be used indirectly with Presto via the Hive connector.

Relevant documentation:
https://prestodb.io/docs/current/develop/connectors.html