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f86cf93435
Have separate routine and http endpoint to create timeline on safekeepers. It is not used yet, i.e. timeline is still created implicitly, but we'll change that once infrastructure for learning which tlis are assigned to which safekeepers will be ready, preventing accidental creation by compute. Changes format of safekeeper control file, allowing to store set of peers. Knowing peers provides a part of foundation for peer recovery (calculating min horizons like truncate_lsn for WAL truncation and commit_lsn for sync-safekeepers replacement) and proper membership change; similarly, we don't yet use it for now. Employing cf file version bump, extracts tenant_id and timeline_id to top level where it is more suitable. Also adds a bunch of LSNs there and rename truncate_lsn to more specific peer_horizon_lsn.