rust-v0.4.0

• added primitive writer API
• added new DeltaTable method get_file_paths_by_partitions
• added new DeltaTable method get_active_add_actions
• added new DeltaTable method update_incremental
• renamed log_bytes_from_actions to log_entry_from_actions
• avoided clone in DeltaTable's get_files method
• renamed camelCased fields to snake_case thanks to @nfx
• added multi-writer support for S3 backend
• optimized vacuum operation
• added checkpoint writer
• added s3-rustls feature
• added checkpoint lambda function
• made lock optional when creating s3 backend
• added missing partition component in parquet path thanks to @viirya
• started using delta statistics (row nums, null count, total bytes) in datafusion integration, thanks to @Dandandan @viirya
• avoid unnecessary object head in DeltaTable's get_latest_version method thanks to @viirya
• fixed file content write flush in fs storage backend