Generate serial-config.properties if Oracle DB is selected

[dalexandrov]

Due to conflict in deserialization in Helidon and Oracle driver the following issue is present:
If Oracle DB is selected, at the current state the error Caused by: java.lang.NullPointerException: Cannot read field "m_ucsChar" because "<local1>" is null occurs on the Helidon application start.
To solve it, a file serial-config.properties file, containing pattern=oracle.sql.converter.* should be added. This may be considered as a temporary workaround.
Relates: #4646

[romain-grecourt]

This issue is related to Helidon archetypes, not to the archetype engine. Moving to Helidon.