feat(protocol): Span Batch Type #696

Job	Run time
wasm-wasi	55s
test stable --no-default-features	58s
test stable	54s
docs	37s
clippy	43s
doctest	1m 2s
test stable --all-features	1m 10s
test nightly --no-default-features	45s
no-std	36s
test nightly	51s
feature-checks	2m 24s
wasm-unknown	55s
test nightly --all-features	1m 4s
test 1.81 --no-default-features	48s
cfg-check	27s
test 1.81	47s
feature-powerset	4m 1s
fmt	11s
	19m 8s

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