Draft: Expose HsIdParseError in TorAddrError::BadOnion

Nick Mathewsonrequested to merge
nickm/arti:badonion_error into main

Having done this, I'm no longer sure that it's right... or that it make sense on its own. See #932 (comment 2916969), and the TODO HS in my last commit here.

Closes #932 (closed). But we shouldn't merge this as-is.

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