Merge torrust/torrust-tracker#1186: Overhaul core Tracker: extract stats #2192

Job	Run time
Build on ubuntu-latest (nightly)	3m 9s
Formatting	22s
Build on ubuntu-latest (stable)	3m 22s
Build on macos-latest (nightly)	4m 11s
Build on macos-latest (stable)	3m 54s
Build on windows-latest (nightly)	6m 33s
Build on windows-latest (stable)	8m 0s
Static Analysis (nightly)	1m 56s
Static Analysis (stable)	2m 1s
Units (nightly)	7m 26s
Units (stable)	5m 43s
E2E (nightly)	15m 7s
E2E (stable)	14m 53s
	1h 16m 37s

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