refactor: [1201] extract InMemoryTorrentRepository #557

Job	Run time
Formatting	24s
Build on ubuntu-latest (nightly)	3m 8s
Build on ubuntu-latest (stable)	3m 15s
Build on macos-latest (nightly)	3m 46s
Build on macos-latest (stable)	2m 56s
Build on windows-latest (nightly)	5m 44s
Build on windows-latest (stable)	7m 43s
Static Analysis (nightly)	2m 19s
Static Analysis (stable)	2m 15s
Units (nightly)	7m 35s
Units (stable)	7m 46s
E2E (nightly)	14m 25s
E2E (stable)	14m 51s
	1h 16m 7s

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