Refactor: reorganize statistics mod #2067

Job	Run time
Formatting	18s
Build on ubuntu-latest (nightly)	3m 17s
Build on ubuntu-latest (stable)	3m 12s
Build on macos-latest (nightly)	4m 25s
Build on macos-latest (stable)	4m 3s
Build on windows-latest (nightly)	6m 23s
Build on windows-latest (stable)	7m 3s
Static Analysis (nightly)	1m 51s
Static Analysis (stable)	1m 44s
Units	0s
E2E	0s
	32m 16s

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