Add BLSamplePosition table

[gfrn]

No description provided.

[KarlLevik]

The script looks good, the only issue is that we probably should not delete the old script but rather create a new script to undo the changes it made.

Something like:

ALTER TABLE Position
    DROP CONSTRAINT IF EXISTS Position_fk_blSampleId,
    DROP IF EXISTS positionType,
    DROP IF EXISTS blSampleId;