Blocking DBClient Part 3

[Tomas-Kraus]

This changeset https://github.com/Tomas-Kraus/helidon/tree/c79f29915285575b50c473d7790484ccbb0f7170/dbclient contains some changes that were removed from DB client during reactive removal.
It would be nice to get them back.
There are 3 main parts to get back:

1. restore common module wit all common parts that are just copy-pasted in jdbc/mongo, restore removed config/context objects
2. restore optimized query parameters processing and make it slightly better (I remember Romain had some design note to it)
3. restore JDBC type specific setters and primitive types auto boxing removal (currently everything is set trough setObject which is not optimal)

[Tomas-Kraus]

Had some discussion with @tomas-langer and @romain-grecourt about this task.

1. We won't restore common module. Common abstract classes will remain part of API
2. Optimization won't be done now. Query parameters processing won't be redesigned.
3. JDBC type specific setters will be called the same way as in EclipseLink.