Added the obm_completeness_assessments table

Merged Nicolas Garcia Ospina requested to merge completeness-assessments into master

With this MR I would like to introduce the obm_completeness_assessments where most of the obmgapanalysis results are stored. By now the fields are the output from the settlement layers data extraction, others may come in the future.

Related discussions should be held soon.

\approve @fd @ds

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