feat(querybuilder): added connectivity between relation and entity

libs/shared/lib/querybuilder/graph/reactflow/handles.tsx

libs/shared/lib/querybuilder/graph/reactflow/utils.ts

libs/shared/lib/querybuilder/panel/querybuilder.stories.tsx

libs/shared/lib/querybuilder/panel/querybuilder.tsx

...red/lib/querybuilder/pills/customFlowLines/connection.tsx

...der/pills/customFlowPills/attributepill/attributepill.tsx

...r/pills/customFlowPills/entitypill/entitypill.module.scss

...rybuilder/pills/customFlowPills/entitypill/entitypill.tsx

...lls/customFlowPills/relationpill/relationpill.module.scss

...ustomFlowPills/relationpill/relationpill.module.scss.d.ts

...ilder/pills/customFlowPills/relationpill/relationpill.tsx