SQLite support for orUpdate

[emibloque]

Issue type:

[ ] question
[ ] bug report
[x] feature request
[ ] documentation issue

Database system/driver:

[ ] cordova
[ ] mongodb
[ ] mssql
[ ] mysql / mariadb
[ ] oracle
[ ] postgres
[ ] cockroachdb
[x] sqlite
[ ] sqljs
[ ] react-native
[ ] expo

TypeORM version:

[x] latest
[ ] @next
[ ] 0.x.x (or put your version here)

In this PR #3056, support for ON CONFLICT was added for MySQL and Postgres when using orUpdate, and in this PR #3190 support for Postgres onConflict was added for SQLite as they have the same syntax.

We want to have support of orUpdate override for SQLite, in order to have compatibility when using MySQL in production and SQLite in tests.

I'm going to create a PR for this as well.