…y ParquetReaderBuilder in tests

 • Remove unnecessary copy in decode_to_batches method of BulkPartEncoder.
 • Streamline ParquetReaderBuilder instantiation in tests by chaining calls and removing intermediate variable.
 • Update documentation comment from "file handle" to "file id" in FileRange.
 • Remove redundant comments and reformat code in ParquetReaderBuilder and Location enums, focusing on functionality changes like enabling inverted and fulltext index checks and
   exposing file path and region id methods.

 Refactor Parquet reader and row group handling in mito2

 - Make `Location` enum public and add async byte fetching method
 - Introduce `RowGroupLocation` to manage row group specific operations
 - Move byte fetching logic from `Sst` to `Location` and `RowGroupLocation`
 - Change `Location` fields and methods to `pub(crate)` for internal use
 - Update `RowGroupReaderBuilder` to use `file_location` instead of `location`
 - Add `fetch_bytes` and cache management methods to `RowGroupLocation`
 - Simplify `InMemoryRowGroup` creation with new `create` method
 - Adjust tests to reflect changes in Parquet reader and row group creation

…nd row group modules

 • Modified decode_to_batches in bulk/part.rs to use placeholders for unused parameters.
 • Enhanced logging in ParquetReader's Drop implementation to include region ID and row group metrics.
 • Added #[allow(dead_code)] to new_memory function in ParquetReaderBuilder.
 • Implemented region_id method in RowGroupReaderBuilder.
 • Added comments to RowGroupLocation methods for clarity.
 • Removed unnecessary comments and unused code.