Support Adding File Metadata Directly

[subthedubdub]

Feature Request / Improvement

Support a table transaction where the user can directly supply the file metadata, similar to the Java Interface.

This is a lower-level operation than what is covered add_files operation and it covers several additional use-cases. For example:

1. Implicit Partitioning: Iceberg does not require that partition values actually be stored in the actual parquet files. And in some cases, it may be useful to define a partiion value of a parquet file after it has been written (or to intentionally exclude to e.g. minimize storage). However, add_files does not currently support an option.
2. Pre-calculated statistics: Calculating parquet statistics (e.g. column bounds) can be a somewhat resource intensive operations. If this has been pre-calculated by the user, it would be faster to update the manifest file directly.