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## Problem In the past we've rolled out all new `compute_ctl` functionality right to all users, which could be risky. I want to have a more fine-grained control over what we enable, in which env and to which users. ## Summary of changes Add an option to pass a list of feature flags to `compute_ctl`. If not passed, it defaults to an empty list. Any unknown flags are ignored. This allows us to release new experimental features safer, as we can then flip the flag for one specific user, only Neon employees, free / pro / etc. users and so on. Or control it per environment. In the current implementation feature flags are passed via compute spec, so they do not allow controlling behavior of `empty` computes. For them, we can either stick with the previous approach, i.e. add separate cli args or introduce a more generic `--features` cli argument.