Ingest land valuations into new schema

[AKST]

• [x] Create nsw_vg.land_valuation relation
  • effective_date (from base_date_n)
  • source_id
  • valuation_id (randomly generated)
  • property_id
  • land_value (from land_value_n)
  • valuation_authority (from authority_n)
  • valuation_basis (from basis_n)
  • zone_code
• [x] Ingest into nsw_vg.land_valuation relation
• [x] Remove dead code from NSW VG
  • [x] Remove v1 code from lib.tasks.nsw_vg.ingest_land_values
  • [x] Remove lib.pipeline.nsw_vg.land_values_legacy
  • [x] Remove legacy sql scripts
• [ ] Update notebooks