scx_stats: Implement macro #stat_doc to autogen doc from stat desc #648

Job	Run time
build-kernel	10s
pages	0s
lint	17s
rust-test-schedulers (scx_bpfland)	7m 2s
rust-test-core (scx_loader)	4m 14s
rust-test-schedulers (scx_lavd)	8m 31s
integration-test (scx_bpfland)	3m 18s
rust-test-schedulers (scx_layered)	8m 27s
integration-test (scx_lavd)	3m 46s
rust-test-core (scx_rustland_core)	7m 44s
rust-test-schedulers (scx_rlfifo)	8m 44s
integration-test (scx_layered)	4m 1s
rust-test-core (scx_stats)	3m 18s
rust-test-schedulers (scx_rustland)	9m 44s
integration-test (scx_rlfifo)	2m 47s
rust-test-core (scx_utils)	8m 32s
rust-test-schedulers (scx_rusty)	8m 2s
integration-test (scx_rustland)	3m 27s
integration-test (scx_rusty)	3m 17s
	1h 35m 21s

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