replace auto codegen with manual codegen #105

Job	Run time
build-kernel	20m 39s
lint	30s
integration-test (scx_layered)	4m 7s
rust-test-schedulers (scx_layered)	2m 39s
layered-matrix (scx_layered, --disable-topology=false)	1m 57s
integration-test (scx_rusty)	3m 50s
rust-test-schedulers (scx_rusty)	2m 3s
rust-test-core (scx_loader)	5m 20s
layered-matrix (scx_layered, --disable-topology=false, --disable-antistall)	1m 22s
rust-test-core (scx_rustland_core)	9m 46s
layered-matrix (scx_layered, --disable-topology=true)	1m 43s
rust-test-core (scx_stats)	3m 28s
layered-matrix (scx_layered, --disable-topology=true, --disable-antistall)	1m 48s
rust-test-core (scx_utils)	10m 39s
	1h 9m 51s

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