feat(protocol): Span Batch Bits #692

Job	Run time
wasm-wasi	35s
doctest	47s
test stable --no-default-features	57s
cfg-check	20s
test stable	49s
clippy	40s
docs	28s
test stable --all-features	58s
feature-checks	58s
test nightly --no-default-features	36s
fmt	14s
no-std	31s
test nightly	53s
wasm-unknown	38s
test nightly --all-features	59s
test 1.81 --no-default-features	38s
feature-powerset	58s
test 1.81	58s
	12m 57s

Provide feedback