Support Druid data source

[JackyYangPassion]

find DruidSchema.java ` Creates a Druid schema.

• @param url URL of query REST service, e.g. "http://localhost:8082"
• @param coordinatorUrl URL of coordinator REST service,
• e.g. "http://localhost:8081"
• @param discoverTables If true, ask Druid what tables exist;
• if false, only create tables explicitly in the model`

but idon't know how can connect with ./bin/quicksql.sh -e

[Functor10]

Druid data source is currently a semi-finished product, it needs to be refined.