SME Review: Add note regarding Postgres OID and Bytea based schema

antferna
Hi Antonio,

Can you please look over the added note and let me know if there is anything you'd like changed or added in the PR.

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NOTE
The PostgreSQL DDL scripts create the PostgreSQL schema with auto-incrementing integer value (OID) columns for entity attributes annotated with @LOB. To use other binary column types such as BYTEA instead of OID, you need to create the PostgreSQL schema with the postgresql-bytea-jbpm-schema.sql script and set the Red Hat Process Automation Manager org.kie.persistence.postgresql.useBytea=true flag. Do not use the postgresql-jbpm-lo-trigger-clob.sql script when creating a BYTEA-based schema. Red Hat Process Automation Manager does not provide a migration tool from OID-based to Bytea-based schema.

Thanks!