Create RelationFilterMetadata

We should be able to set default filter on relations. One use-case is for the opportunities field, we shouldn't be able to assign a person that is from a different company than the company attached to the opportunity. Another use-case would be to create a field FutureTasks which only show tasks in the future. I think we should create a dedicated table relationFiltersMetadata. With columns: relationMetadataId, toFieldMetadataId, operand, filterValueFieldMetadataId, filterValueRaw fieldMetadataId is for the left side of the operand the right side can be either a fixed value (value column) or another field in the same table (valueAsAFieldMetadataId) In the case of an opportunities' point of contact, we would add a single Filter record with values: • relationMetadataId: id of the opportunities <-> people relation • toFieldMetadataId: point of contact field • operand: eq (equal) • filterValueFieldMetadataId: id of the company field o…