feat(protocol): Span Batch Type #718

Job	Run time
test stable --no-default-features	59s
test stable	53s
doctest	24s
test stable --all-features	1m 18s
feature-checks	57s
test nightly --no-default-features	41s
no-std	29s
test nightly	54s
wasm-unknown	30s
test nightly --all-features	1m 3s
wasm-wasi	37s
test 1.81 --no-default-features	44s
test 1.81	29s
cfg-check	22s
clippy	30s
docs	25s
feature-powerset	1m 56s
fmt	16s
	13m 27s

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