scx_stats: Implement macro #stat_doc to autogen doc from stat desc #659

Job	Run time
build-kernel	11s
lint	16s
pages	0s
rust-test-schedulers (scx_bpfland)	7m 44s
rust-test-core (scx_loader)	4m 5s
integration-test (scx_bpfland)	3m 36s
rust-test-schedulers (scx_lavd)	8m 44s
rust-test-core (scx_rustland_core)	7m 33s
integration-test (scx_lavd)	3m 35s
rust-test-schedulers (scx_layered)	8m 13s
rust-test-core (scx_stats)	3m 10s
integration-test (scx_layered)	3m 21s
rust-test-schedulers (scx_rlfifo)	8m 49s
rust-test-core (scx_utils)	8m 14s
integration-test (scx_rlfifo)	3m 14s
rust-test-schedulers (scx_rustland)	9m 31s
integration-test (scx_rustland)	3m 12s
rust-test-schedulers (scx_rusty)	8m 11s
integration-test (scx_rusty)	3m 39s
	1h 35m 18s

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