[tracking issue] Single-file classic-named V1 & V2 checkpoint write support

[sebastiantia]

Tracking issue for single-file classic-named V1 & V2 checkpoint write support:

• refactor: Move testing helper function to test_utils mod #794
• refactor: Rename _last_checkpoint from CheckpointMetadata to LastCheckpointHint #789
• feat: add classic and uuid parquet checkpoint path generation #782
• feat: add CheckpointMetadata action #781
• refactor: extract log replay processing structure into LogReplayProcessor trait #774
• refactor: extract deduplication logic from AddRemoveDedupVisitor into embeddable FileActionsDeduplicator #769
• feat: add CheckpointVisitor in new checkpoint mod #738
• feat: add CheckpointLogReplayProcessor in new checkpoints mod #744
• feat: overwrite logic in write_json_file for default & sync engine  #849
• feat: add Snapshot::checkpoint() & Table::checkpoint() API #797
• feat: add CheckpointWriter::finalize() API #851

Remaining (future) work:

• feat: write checksum in _last_checkpoint file #838
• feat: write checkpoint_schema in _last_checkpoint file #839
• tests: Integration tests for checkpointing reads & writes #886