Fix staging parquet file checks in sync and query

[trueleo]

Fixes #258

Description

• Move remove link procedure to Drop impl for table provider because it always has to run on exit.
• If any parquet file path is not in File table during lookup then we treat it as if it is already uploaded and skip past it
• Fixed possibility of double upsert when generating possible parquet paths for query.

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This PR has:

• been tested to ensure log ingestion and log query works.
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added documentation for new or modified features or behaviors.