scx_layered: Add per layer weights #908

Job	Run time
build-kernel	15s
pages	0s
lint	16s
rust-test-core (scx_loader)	4m 26s
rust-test-schedulers (scx_bpfland)	7m 44s
rust-test-core (scx_rustland_core)	7m 51s
integration-test (scx_bpfland)	3m 6s
rust-test-schedulers (scx_lavd)	8m 15s
rust-test-core (scx_stats)	2m 58s
integration-test (scx_lavd)	3m 19s
rust-test-schedulers (scx_layered)	8m 23s
rust-test-core (scx_utils)	8m 40s
rust-test-schedulers (scx_rlfifo)	9m 9s
integration-test (scx_layered)	3m 25s
rust-test-schedulers (scx_rustland)	10m 28s
integration-test (scx_rlfifo)	2m 54s
rust-test-schedulers (scx_rusty)	8m 34s
integration-test (scx_rustland)	3m 26s
integration-test (scx_rusty)	3m 33s
	1h 36m 42s

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