Add ability to estimate file size lazily

[sauliusvl]

Currently the RecordBatchingSinker checks whether a batch should be finalized after processing every record, to do that it passes the current record count and the current file size to a given FileCommitStrategy. The problem is that estimating the file size for formats like parquet can be very expensive, we observe ~15% of total time spent there. In addition, the file size in case of parquet is only an estimate, so doing it so frequently is pointless.

We thus change the interface of FileCommitStrategy to accept the file size lazily, i.e. if the strategy does not invoke it, it will not be calculated. In addition we tune FuzzyReachedAnyOf to have a configurable fileSizeSamplingBatchSize, i.e. a number of records processed that triggers a file size check (e.g. every 1000 records). By default it checks every time so that the default behavior remains the same.