feat: buffer pending messages during join by external commit process … #2453

Job	Run time
check-strict	9m 15s
fmt	34s
check	2m 0s
build	4m 15s
proteus-test	4m 31s
test	16m 49s
tooling-test	10m 15s
wasm-build (crypto)	2m 6s
wasm-build (keystore)	1m 37s
wasm-build (mls-provider)	1m 57s
e2e-interop-test	11m 40s
hack	2m 53s
proteus-wasm-test	3m 20s
wasm-test (core-crypto)	12m 56s
wasm-test (core-crypto-keystore)	5m 39s
wasm-test (mls-crypto-provider)	4m 18s
	1h 34m 5s

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