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arti,arti-client,tor-memquota: Always enable the memquota system

opararequested to merge
opara/arti:enable-memquota into main

For #2030 as part of congestion control / flow control. The main changes are:

tor-memquota:

  • Support the "auto" config value for the max and low_water options.
  • Change the default to be enabled rather than disabled.
  • When enabled with "auto" (the default), a max is chosen based on the system's total available memory (and cgroup on Linux).
  • There is a small breaking change in the config builder struct, which may cause type inference breakage for the few users who set memquota config options in the code.

arti/arti-client:

  • Always enable the "tor-memquota/memquota" feature.
  • Make the "arti/memquota" and "arti-client/memquota" features no-ops.

I'm not a big fan of the sysinfo crate, but it seems good enough for now.

/cc @Diziet, @dgoulet

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