derive Immutable and KnownLayout for f16 and bf16 #220

Job	Run time
Miri	1m 0s
Rust (ubuntu-latest, x86_64, stable)	1m 5s
Rust (ubuntu-latest, i686, stable)	21s
Rust (ubuntu-latest, x86_64, beta)	1m 8s
Rust (ubuntu-latest, aarch64, stable)	29s
Rust (ubuntu-latest, i686, 1.81.0)	21s
Rust (ubuntu-latest, x86_64, 1.81.0)	1m 2s
Rust (ubuntu-latest, i686, beta)	26s
Rust (windows-latest, x86_64, beta)	2m 33s
Rust (windows-latest, i686, nightly)	1m 29s
Rust (ubuntu-latest, aarch64, beta)	28s
Rust (ubuntu-latest, aarch64, 1.81.0)	27s
Rust (ubuntu-latest, i686, nightly)	22s
Rust (windows-latest, x86_64, nightly)	2m 37s
Rust (windows-latest, i686, beta)	1m 17s
Rust (windows-latest, i686, 1.81.0)	1m 18s
Rust (windows-latest, x86_64, stable)	2m 41s
Rust (windows-latest, x86_64, 1.81.0)	2m 32s
Rust (windows-latest, i686, stable)	1m 25s
Rust (ubuntu-latest, x86_64, nightly)	1m 4s
Rust (windows-latest, aarch64, beta)	1m 13s
Rust (windows-latest, aarch64, stable)	1m 31s
Rust (ubuntu-latest, aarch64, nightly)	24s
Rust (windows-latest, aarch64, 1.81.0)	50s
Rust (windows-latest, aarch64, nightly)	58s
	29m 1s

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