Add multiple read replica endpoints to a Gremlin Java connection pool

When creating a Gremlin Java Cluster object, you can use the .addContactPoint() method to add multiple read replica instances to the connection pool's contact points.

Cluster.Builder readerBuilder = Cluster.build()
          .port(8182)
          .minConnectionPoolSize(…)
          .maxConnectionPoolSize(…)
          ………
          .addContactPoint("reader-endpoint-1")
          .addContactPoint("reader-endpoint-2")