Add proper support for BOOLEAN datatype for Oracle 19c, 21c and 26ai

[loiclefevre]

Feature description

BOOLEAN datatype is supported starting from 23ai (version: 23.1.0+). With this support comes:

• the datatype
• some functions (TO_BOOLEAN())
• some new filtering clause: WHERE FALSE, WHERE ACTIVE -- given active is of BOOLEAN datatype, WHERE A IS FALSE, etc.
• automatic conversions: 't' => TRUE, 'f' => FALSE, 0 => FALSE, 1 => TRUE, etc.

When dealing with BOOLEAN, we should expect these to be possible/managed (including within the unit tests) given we are in 23.1.0+ version.

For pre-23ai versions, such as 19c or 21c, we should consider using the old way.