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feat(string): make `from_utf8_unchecked` const #921

Job	Run time
clippy	20s
clippy	18s
check (x86_64-unknown-linux-gnu)	26s
check (x86_64-unknown-linux-gnu)	16s
check (i686-unknown-linux-musl)	26s
check (i686-unknown-linux-musl)	20s
check (riscv32imc-unknown-none-elf)	26s
check (riscv32imc-unknown-none-elf)	21s
test	27s
test	27s
check (armv7r-none-eabi)	2m 38s
check (armv7r-none-eabi)	20s
doc (x86_64-unknown-linux-gnu)	20s
doc (x86_64-unknown-linux-gnu)	19s
doc (thumbv7m-none-eabi)	24s
doc (thumbv7m-none-eabi)	21s
check (thumbv6m-none-eabi)	25s
check (thumbv6m-none-eabi)	18s
style	13s
style	13s
testcfail	22s
testcfail	21s
check (thumbv7m-none-eabi)	22s
check (thumbv7m-none-eabi)	18s
check (thumbv8m.base-none-eabi)	18s
check (thumbv8m.base-none-eabi)	17s
testcpass (x86_64-unknown-linux-gnu)	16s
testcpass (x86_64-unknown-linux-gnu)	17s
testmiri	1m 11s
testmiri	1m 13s
testtsan (x86_64-unknown-linux-gnu)	38s
testtsan (x86_64-unknown-linux-gnu)	38s
check (thumbv8m.main-none-eabi)	22s
check (thumbv8m.main-none-eabi)	17s
testcpass (x86_64-unknown-linux-gnu, --release)	16s
testcpass (x86_64-unknown-linux-gnu, --release)	17s
testtsan (x86_64-unknown-linux-gnu, --release)	40s
testtsan (x86_64-unknown-linux-gnu, --release)	45s
testcpass (i686-unknown-linux-musl)	21s
testcpass (i686-unknown-linux-musl)	19s
testcpass (i686-unknown-linux-musl, --release)	27s
testcpass (i686-unknown-linux-musl, --release)	19s
	19m 32s

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