`SingleAttestation` implementation #19745

Job	Run time
target-branch-check	1s
Check for 'skip-ci' label	1s
check-code	6m 27s
check-msrv	5m 9s
lockbud	6m 17s
beacon-chain-tests	6m 19s
release-tests-windows	6m 4s
op-pool-tests	6m 17s
debug-tests-ubuntu	6m 19s
release-tests-ubuntu	6m 21s
network-tests	6m 16s
slasher-tests	1m 57s
basic-simulator-ubuntu	6m 15s
cargo-udeps	6m 16s
compile-with-beta-compiler	6m 14s
ef-tests-ubuntu	6m 18s
execution-engine-integration-ubuntu	6m 19s
fallback-simulator-ubuntu	6m 16s
state-transition-vectors-ubuntu	2m 35s
cli-check	6m 16s
cargo-sort	30s
test-suite-success	1s
	1h 44m 28s

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