feat: add byte array type and string conversions #1461

Job	Run time
no-std build	51s
Unix tests (ubuntu-latest, stable)	2m 41s
Windows tests (stable, x86_64-pc-windows-gnu)	5m 27s
Unix tests (ubuntu-latest, nightly)	2m 59s
Windows tests (stable, x86_64-pc-windows-msvc)	4m 30s
Windows tests (nightly, x86_64-pc-windows-gnu)	4m 47s
Unix tests (macos-13, stable)	2m 53s
WASM tests	4m 5s
Unix tests (macos-13, nightly)	3m 1s
Windows tests (nightly, x86_64-pc-windows-msvc)	4m 17s
Unix tests (macos-14, stable)	2m 34s
Unix tests (macos-14, nightly)	2m 21s
	40m 26s

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