DRILL-7938: Convert JDBC Storage Plugin to EVF
* Initial Commit
* Most unit tests passing
* Null column issue fixed
* All unit tests passing
* Ignored h2 unit test due to improper timezone support
* Code cleanup
* Removed extra character
* Bump HikariCP to version 4.0.3
* Addressed review comments. Precision and Scale remaining
* Removed unused imports
* Addressed precision and scale comment
* Updated Timezone for h2 tests
* Removed Whitespace
