Bug 1612: Allow programmatic launching of onion-service with user-provided HsIdKeypair

morganrequested to merge
morgan/arti:bug_1612v2 into main

Resolves #1612 (closed)

Simply adds an experimental method TorClient::launch_onion_service_ex() which additionaly takes an HsIdKeypair. It's an error to insert an HsIdKeypair for a given nickname multiple times.

Includes the KeyMgr::insert() commit from !2396 (merged) which adds overwrite flag which mirrors KeyMgr;:generate() semantics.

/cc @gabi-250

Edited by morgan

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