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Add the support of storage and retrieval of samples with future timestamps as requested in https://github.com/VictoriaMetrics/VictoriaMetrics/issues/827 What to expect: - By default, the max future timestamp is still limited to `now+2d`. To change it, set the `-futureRetention` flag in `vmstorage`. The max flag value is currently limited to `100y`. It can be extended if we see a demand for this, but it can't be more than `~ 290y` due to how the time duration is implemented in Go. The flag value can't be less than `2d`. - downsampling and retention filters (available in enterprise edition) are currently not supported for future timestamps - If `vmstorage` restarts with a smaller value of `-futureRetention` flag, any future partitions that are outside the new future retention will be automatically deleted. - Data ingestion, data retrieval, backup/restore, timeseries (soft) deletion, and other operations work with future timestamps the same way as with the historical timestamps. - In the cluster version, the affected binaries are `vmstorage` and `vmselect`. This means that `vmselect` version must match `vmstorage` version if you want to query future timestamps. `vminsert` was not affected, so its version can be a lower one. - If you downgrade the `vmstorage`, the data with future timestamps will remain on disk and memory (per-partition caches) but won't be available for querying. Signed-off-by: Artem Fetishev <rtm@victoriametrics.com> Signed-off-by: Artem Fetishev <149964189+rtm0@users.noreply.github.com> Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>