feat: add missing indexes to the oracle ddl script

[iluwa]

Add missing indexes to the oracle ddl script

Every example for other databases (Postgres, Mssql, Mysql) contains indexes on execution_time and last_heartbeat while for Oracle DB they are missing.

I also expanded DbUtiils method to allow splitting sql statements from an sql file. jdbcRunner.execute(statement, NOOP) can run only one statement at a time for Oracle Db.

PS: two tests for oracle db are failing on master, is that expected?

Reminders

• [x] Added/ran automated tests
• [x] Update README and/or examples
  • no need
• [x] Ran mvn spotless:apply

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cc @kagkarlsson

[kagkarlsson]

🎉 This issue has been resolved in v14.0.3 (Release Notes)