[Gravity] Add query syntax support for upserts

Review Request #664 — Created May 22, 2019 and submitted — Latest diff uploaded

pprkut
Lunr
21f8f21...
lunr

Add query syntax support for upserts

SQLite: https://www.sqlite.org/lang_UPSERT.html
MySQL: https://dev.mysql.com/doc/refman/8.0/en/insert.html
MariaDB: https://mariadb.com/kb/en/library/insert-on-duplicate-key-update/
PostgreSQL: http://www.postgresqltutorial.com/postgresql-upsert/

Unit tests, example queries

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