arti: Add subcommand for generating service identity keys

gabi-250requested to merge
gabi-250/arti:hss-generate-hsid into main

⚠ This builds on top of the changes from !2417 (merged) ⚠

This branch starts at tor-hsservice: Make maybe_generate_hsid take a selector. (currently d8118c302412020bf67b4c534c403071592f7f7b)

This adds a new hss get-key subcommand for retrieving and generating service identity keys. The existing hss onion-name is now a convenience alias for hss get-key --generate=no --key-type=onion-name.

Note: I am calling this new subcommand get-key for consistency with its client counterpart (hsc get-key).

Closes #1621 (closed)

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