implement dpi_adpater.erl and port coi_adapter.erl functionalities

cc @acautin for design PR review etc

@c-bik branch https://github.com/K2InformaticsGmbH/dderl/tree/oranif-integration contains the basis for simple integration, sadly could not tested so I doubt it will be working properly.

After K2InformaticsGmbH/oranif#117 is implemented, you can try to do

select * from <BIGTABLE> to see if you have some luck and maybe can get a feel for the performance

The following query fails on ZHH management when connected to SBS1.EXAPROD, the dderl session dies with {error,noproc}

SELECT
    REVICS_SEPID, REVICS_SHORTID, REVICS_ROWID_MASTER, REVICS_COUNT_EXPECTED,
    REVICS_TABLE_SLAVE, REVICS_ROWID_SLAVE
FROM
    SBS1_ADMIN.REVI_CONTENT_SUB
WHERE
    REVICS_SEPID = '201907'
    AND REVICS_ROWID_SLAVE IS NULL

In TOAD, 67'000 rows are returned.
It would be a good (advanced) test to see that this now works with the new Oracle driver.