Overhaul core Tracker: add tests for `torrent` mod #2375

Job	Run time
Formatting	15s
Build on ubuntu-latest (nightly)	3m 16s
Build on ubuntu-latest (stable)	3m 17s
Build on macos-latest (nightly)	3m 43s
Build on macos-latest (stable)	3m 2s
Build on windows-latest (nightly)	6m 53s
Build on windows-latest (stable)	7m 7s
Static Analysis (nightly)	1m 51s
Static Analysis (stable)	2m 53s
Units (nightly)	7m 34s
Units (stable)	6m 10s
E2E (nightly)	14m 52s
E2E (stable)	15m 21s
	1h 16m 14s

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