move aggregation out of `EndBlock` #84

Job	Run time
build-primary	2m 45s
build-ibc	2m 46s
prepare	35s
test (TestGas)	3m 42s
test (TestIbcInterchainQuery)	4m 33s
test (TestLearn)	4m 4s
test (TestLayerUpgrade)	3m 15s
	21m 40s

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