feat: collect attestations during slot #2928

Job	Run time
Download spectests	7s
Lint	1m 49s
Download Beacon Node OAPI	4s
Build native libraries	13s
Build project	2m 37s
Run spec-tests (capella, minimal)	2m 56s
Test	4m 31s
Start and stop the node	2m 43s
Run spec-tests (capella, general)	2m 49s
Run spec-tests (capella, mainnet)	2m 48s
Run spec-tests (deneb, minimal)	2m 57s
Run spec-tests (deneb, general)	3m 6s
Run spec-tests (deneb, mainnet)	2m 53s
All spec-tests passed	1s
	29m 34s

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