feat(quantized): F16 type + ScalarOperand for burn NdArrayElement (#1… #227

Job	Run time
Pass MSRV values to other jobs	4s
native-backend/stable	53s
miri	33s
docs/nightly	54s
nostd/thumbv6m-none-eabi/stable	35s
clippy/stable	39s
cross_test/s390x-unknown-linux-gnu/stable	1m 47s
format/stable	29s
cross_test/i686-unknown-linux-gnu/stable	1m 45s
cargo-careful	37s
blas-msrv	1m 24s
tests/beta	59s
tests/stable	35s
tests/1.64.0	1m 5s
conclusion	0s
	12m 19s

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