[tor-bugs] #32690 [Core Tor/Tor]: Create new directive HiddenServiceExportStats.

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#32690: Create new directive HiddenServiceExportStats.
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 Reporter:  moonsikpark  |          Owner:  moonsikpark
     Type:  defect       |         Status:  assigned
 Priority:  Medium       |      Component:  Core Tor/Tor
  Version:               |       Severity:  Normal
 Keywords:  tor-hs       |  Actual Points:
Parent ID:  #32511       |         Points:
 Reviewer:               |        Sponsor:
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 Currently `HiddenServiceExportCircuitID` specifies the protocol. As we
 move towards exporting as much stats as we can, I think it's better to
 create a new directive(`HiddenServiceExportStats`) for the protocol only.

 Also, I need some opinions on the directives.

 1. Create directive per stat(`HiddenServiceExport*`), make all of them
 bound to the hidden service (in `hs_service_config_t`).
 2. Create directive per stat, only `HiddenServiceExportStats` bounds to
 the hidden service and others are global (in `or_options_st`).
 3. Don't create directive per stat, Only one directrive
 `HiddenServiceExportStats`, bound to the hidden service, exports all.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32690>
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