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Add follow mode to the restore command

Add follow mode to the restore command: a task in LegoFlow-SWE (Harbor dataset). Currently, litestream restore performs a one-shot restore and exits. This makes it impossible to keep a read-only database replica continuously in sync with the source replica without repeatedly running restore in a…

The task

Currently, `litestream restore` performs a one-shot restore and exits. This makes it impossible to keep a read-only database replica continuously in sync with the source replica without repeatedly running restore in a loop, which is inefficient and error-prone.

Part of Lego-X/LegoFlow-SWE.