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Add `efi_rng` opt-in backend #194

Job	Run time
Cross (sparcv9-sun-solaris)	36s
Cross (x86_64-unknown-illumos)	28s
ESP-IDF	20s
Linux x32 (x86_64-unknown-linux-gnux32)	37s
Apple Other	47s
UEFI RNG Protocol (aarch64-unknown-uefi)	29s
No Atomics	18s
RNDR	23s
UEFI RNG Protocol (x86_64-unknown-uefi)	30s
RDRAND UEFI (x86_64-unknown-uefi)	31s
UEFI RNG Protocol (i686-unknown-uefi)	35s
RDRAND UEFI (i686-unknown-uefi)	31s
Tier 2 (x86_64-unknown-fuchsia)	17s
Tier 3 (aarch64-kmc-solid_asp3)	25s
Tier 2 (x86_64-unknown-redox)	17s
Tier 3 (aarch64-unknown-nto-qnx710)	24s
Web no_std	25s
Tier 3 (armv6k-nintendo-3ds)	20s
Web no_std with Atomics	30s
Tier 2 (x86_64-fortanix-unknown-sgx)	14s
Tier 3 (armv7-sony-vita-newlibeabihf)	20s
Web	29s
Tier 3 (i686-unknown-hurd-gnu)	25s
Web with Atomics	33s
Tier 3 (x86_64-unknown-hermit)	23s
WasmV1 no_std	23s
Tier 3 (x86_64-wrs-vxworks)	27s
Tier 3 (x86_64-unknown-dragonfly)	22s
WasmV1 no_std with Atomics	29s
Tier 3 (x86_64-unknown-haiku)	23s
	13m 11s

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