Create an aggregate from subset of messages #583

Job	Run time
wasm-test (1.67, wasm32-unknown-unknown)	3m 46s
yarn-test (stable, wasm32-unknown-unknown)	2m 14s
python-test (stable, wasm32-unknown-unknown, 3.11)	1m 48s
wasm-test (stable, wasm32-unknown-unknown)	3m 43s
check	29s
python-test (stable, wasm32-unknown-unknown, 3.12)	1m 50s
test (x86_64-unknown-linux-gnu, 1.67)	2m 45s
test (x86_64-unknown-linux-gnu, stable)	2m 36s
compile-benchmarks	3m 26s
codecov	7m 35s
benchmark	0s
	30m 12s

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