Draft: Add HS client key manager sketch.

gabi-250requested to merge
gabi-250/arti:hs-client-keymgr-api-sketch into main

This is a first attempt at defining an API for the HS client key manager.

  • the client key manager (HsClientKeyMgr) lives in the new tor-keymgr crate. Future versions of this crate will also expose HsServiceKeyMgr, which will be used by services to manage client auth keys
  • the tor-hsclient::keys module is moved to tor-keymgr::keys (to avoid a circular dependency between tor-hsclient and tor-keymgr)
  • TorClient now contains a HsClientKeyMgr for retrieving client auth keys
  • arti-client has some new *Config types for configuring a HsClientKeyMgr that uses either the legacy storage format or the current one (TBD what the current one looks like)

Part of #728 (closed).

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