Rollup node: produce compressed snapshot on the fly

Alain Mebsoutrequested to merge
alain@functori@snapshot-compress-in-place into master

Context

This MR allows to produce compressed snapshots on the fly (with CLI switch --compress-on-the-fly). The rollup node will use less disk space to produce the snapshot but will lock the rollup node (if running) for a longer (~10x) time.

Manually testing the MR

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