Support for parsing Onion Service circuit IDs
# Tasks
* [x] Add support for parsing Onion Service circuit IDs (tpo/onion-services/eotk-log-parser!1).
* [x] Add sample logs (examples [here](https://gitlab.torproject.org/tpo/onion-services/eotk/-/issues/7#note_2983581)).
* [x] Aggregate page hits by site and circuit ID.
* [~] Optionally decode the circuit identifier to the actual circuit number (check `tor(1)` manpage for details). Not needed right now (as this tools is not intended to close circuits).
* [x] Release version 1.0.0 (major number bumped due to breaking changes).
# Time estimation
* Complexity: very small (0.5 day)
* Uncertainty: low (x1.1)
* [Reference](https://jacobian.org/2021/may/25/my-estimation-technique/) (adapted)
issue