feat(maitake-sync): rename `EnqueueWait` to `Subscribe` #1363

Job	Run time
changed_paths	4s
cargo test (host)	4m 32s
rustfmt	17s
cargo check (host)	3m 42s
build boot image (x86_64)	3m 8s
clippy	2m 48s
Loom tests (cordyceps)	1m 42s
Miri tests (codyceps)	1m 54s
docs	4m 13s
cargo test (cross x64)	4m 7s
Loom tests (maitake)	4m 25s
Tests (maitake, no-default-features)	1m 37s
Loom tests (mycelium-util)	53s
	33m 22s

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