Partition overwrite strategy for DuckDB

[begelundmuller]

Example usage:

type: model
partitions:
  glob: s3://bucket/path/**.parquet
sql: SELECT '{{.partition.path}}' as partition_id, * FROM read_parquet('{{.partition.uri}}')
output:
  incremental_strategy: partition_overwrite
  partition_by: partition_id

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated
• Intend to cherry-pick into the release branch
• I'm proud of this work!