fix: Circuit build results are not being inserted into erpc.db

we were polling recv_completed_work() and sending results into tor_network_completed_work_sender, but we were not storing them in the database (erpc.db) unless OnionPerf is used, so i fixed it by Storing the result into SQLite DB after receiving CompletedWork from the scanner.

Closes: #29 Signed-off-by: Harshita Roonwal roonwal721972@gmail.com