Storage: Flushing row group of profiles.

[cyriltovena]

• Ingest straight into parquet buffer reduce memory footprint by using parquet buffer compression.
• Then once the buffer is full flush a chunk to either a row group or just file ???
• Chunk meta from the index.
• Finally every x hour or if the symbols+index is too big flush the block.

[cyriltovena]

In a way we basically need to compact the profiles.parquet into a bigger file.