Squashed 'sensible_data_service/connectors_core/' content from commit 6258864

git-subtree-dir: sensible_data_service/connectors_core
git-subtree-split: 62588645bee2976fac6271b265ae70a39da24b13
Merge commit '36a94a92cf920c3b47cfd1e43011f2d3adc2e5c3' as 'sensible_data_service/connectors_core'
added gittrees