Replace column.parent with the more descriptive column.reference object

• Update documentation 0d64c2b
• Add reference field on columns 714d686
• Update testcontainers ab9dfd3
• Split into multiple files f34f31c
• Add prettier linter-rule 83d03a1
• Bump bl from 4.0.2 to 4.0.3 (#11) 95f8268

v1.6.0...v1.7.0