Add `f16`/`f128` support #4008

Job	Run time
rustfmt	13s
bench	6m 52s
dist (ubuntu-22.04, x86_64-unknown-linux-gnu)	1m 43s
dist (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	1m 46s
dist (macos-13, x86_64-apple-darwin)	2m 27s
test_llvm	1m 36s
dist (windows-latest, x86_64-pc-windows-gnu)	4m 13s
test (macos-13, x86_64-apple-darwin)	5m 9s
dist (windows-latest, x86_64-pc-windows-msvc)	2m 27s
test (ubuntu-latest, s390x-unknown-linux-gnu, gcc-s390x-linux-gnu qemu-user)	2m 9s
dist (macos-latest, aarch64-apple-darwin)	1m 54s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	18m 46s
test (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	10m 10s
test (macos-latest, aarch64-apple-darwin)	13m 9s
test (windows-latest, x86_64-pc-windows-msvc)	16m 21s
test (windows-latest, x86_64-pc-windows-gnu)	20m 50s
test (ubuntu-latest, riscv64gc-unknown-linux-gnu, gcc-riscv64-linux-gnu qemu-user)	5m 20s
release	-1s
	1h 55m 4s

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