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This PR introduces a `image_creation_timeout` to page servers so that we can force the image creation after a certain period. This is set to 1 day on dev/staging for now, and will rollout to production 1/2 weeks later. Majority of the PR are boilerplate code to add the new knob. Specific changes of the PR are: 1. During L0 compaction, check if we should force a compaction if min(LSN) of all delta layers < force_image_creation LSN. 2. During image creation, check if we should force a compaction if the image's LSN < force_image_creation LSN and there are newer deltas with overlapping key ranges. 3. Also tweaked the check image creation interval to make sure we honor image_creation_timeout. Vlad's note: This should be a no-op. I added an extra PS config for the large timeline threshold to enable this. --------- Co-authored-by: Chen Luo <chen.luo@databricks.com>