Investigate possibility to support multiple types of writers

[dgray16]

• Load Job - Implemented (JSON/CSV)
• Write API - partially implemented (JSON)
• Streaming - defined as lagacy - https://cloud.google.com/bigquery/streaming-data-into-bigquery
• JDBC / ODBC Driver - TO BE REVIEWED (requires HTTPS, no emulator support) - https://cloud.google.com/bigquery/docs/reference/odbc-jdbc-drivers