feat(x86_64): debug commands to print CPUID & MSRs #1410

Job	Run time
changed_paths	6s
clippy	2m 52s
cargo check (host)	3m 57s
rustfmt	24s
build boot image (x86_64)	3m 8s
cargo test (host)	4m 47s
Loom tests (cordyceps)	1m 25s
Miri tests (cordyceps)	1m 58s
docs	4m 17s
Loom tests (maitake)	4m 8s
Miri tests (maitake)	18m 15s
Tests (maitake, no-default-features)	1m 43s
cargo test (cross x64)	5m 15s
all_systems_go	1s
	52m 16s

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