Add non-sys DB user option to ORDS Docker image

[bdahav]

The current ORDS docker-image (https://container-registry.oracle.com/ords/ocr/ba/database/ords) is designed to use the database SYS user.
In the instructions the ORACLE_PWD parameter is described as "The Oracle Database SYS password".
ORDS can support non-SYS users after running the relevant script in the DB prior to installation (https://docs.oracle.com/en/database/oracle/oracle-rest-data-services/25.3/ordig/installing-REST-data-services.html#GUID-C613F122-E849-4EDC-8169-04140EDCFB64) but this is not part of the setting of the Docker_image of ORDS.

The enhancement request is to add non-SYS database user option. Such as ORACLE_USER_NAME optional parameter that would be the name of the database user with the ords_installer_privileges.sql script privileges to the ORDS Docker image creation script.

#ORDS

[chrishoina]

For reference: linked to internal issue ORDS-20275
Still awaiting triage and sprint selection.