DRILL-8005: Add Writer to JDBC Storage Plugin (#2327)
* Initial commit
* Getting to writer
* Schema should be created
* Queries complete
* Queries successfully completing
* WIP
* WIP
* Fixed schema resolution issue
* Fixed VARCHAR precision issue
* Added writable config option
* Mostly working
* Added Postgres Unit Tests, Some working
* All Postgres tests working
* Fix spacing
* Code Cleanup
* WIP
* WIP - Null rows
* Null input working
* Added additional unit tests
* Finished MySQL unit tests
* MySQL and Postgres Tests all Passing
* h2 writer tests working
* Final commit
* Ready for PR
* Final fixes
* Add license header
* Fixed MySQL Timezones in unit tests
* Removed unused import
* Remove unneeded unit tests
* Minor fixes
* Working on docs
* Addressed code comments
* Fixed unit test
* Added test for large file
* Updated tutorial
* Added tests for large inserts
* Added documentation
* Addressed Review Commnet
* De-hacking
* Removed ROW Hack
* Added configurable batching
