Add support for Oracle

[octgsoftware]

This should only require writing proper native SQL files for 3 queries and a SqlJdlTypeService.

[Blackdread]

Re-opening this ticket, I think there is still work to be done.
See comment of first PR #177 (comment)

I think, some steps needed:

• remove logic if (value.equals("NUMBER(38)") || value.equals("NUMBER(19,5)")) from public static String parseSqlType(String value) of SqlUtils -> Define overridden method in OracleJdlTypeService for default JdlFieldEnum sqlTypeToJdlType(final String sqlType) -> so we can handle oracle specific types and parsing differentely
• handle more types
• allow definition of short, int, long
• better handling of decimal(p, s) -> NUMBER [ (p [, s]) ]

Docs:

• https://docs.oracle.com/database/121/SQLRF/sql_elements001.htm#SQLRF30020
• https://www.oracletutorial.com/oracle-basics/oracle-data-types/
• https://www.w3resource.com/oracle/oracle-data-types.php