feat(protocol): Span Batch Element #688

Job	Run time
wasm-wasi	21s
wasm-unknown	22s
cfg-check	19s
clippy	36s
docs	21s
doctest	34s
feature-checks	33s
feature-powerset	20s
fmt	11s
no-std	26s
test stable --no-default-features	20s
test stable	20s
test stable --all-features	21s
test nightly --no-default-features	20s
test nightly	21s
test nightly --all-features	20s
test 1.81 --no-default-features	21s
test 1.81	21s
	6m 47s

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