[tor-bugs] #30687 [Core Tor/Tor]: Implement a generic counter token bucket

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#30687: Implement a generic counter token bucket
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     Reporter:  dgoulet         |      Owner:  (none)
         Type:  enhancement     |     Status:  new
     Priority:  Medium          |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor    |    Version:
     Severity:  Normal          |   Keywords:
Actual Points:                  |  Parent ID:  #15516
       Points:  0.1             |   Reviewer:
      Sponsor:  Sponsor27-must  |
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 We have the `_raw_t` interface and a `_rw_t` specialized one. Many use
 cases only need a single counter like for instance the circuit creation
 DoS defense would use that. Or #15516 introduce2 rate limiting.

 After a discussion with nickm, it would be wise if we can simply implement
 a generic counter token bucket:

 {{{
 token_bucket_ctr_t
 }}}

 ... with a single bucket in it and thus could generically be used by many
 subsystems.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30687>
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