Add comments to processBlock functions

[dapplion]

Motivation

Add context for future optimizations

Description

Add a short description about function purpose + relevant performance info about the function cost

[codeclimate]

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[github-actions]

Performance Report

✔️ no performance regression detected

Full benchmark results

Benchmark suite	Current: 39cf947	Previous: fb5e41f	Ratio
getCommitteeAssignments - req 1000 vs - 250000 vc	8.1511 ms/op	9.8207 ms/op	0.83
processBlock altair 250000 vs - 7PWei - maxed ops	494.04 ms/op	506.91 ms/op	0.97
processBlock altair 250000 vs - 7PWei - average	189.55 ms/op	194.22 ms/op	0.98
epoch altair - 250000 vs - 7PWei - processInactivityUpdates	2.5642 s/op	2.5514 s/op	1.01
epoch altair - 250000 vs - 7PWei - processRewardsAndPenalties	1.0476 s/op	1.2361 s/op	0.85
epoch altair - 250000 vs - 7PWei - processParticipationFlagUpdates	469.30 ms/op	504.85 ms/op	0.93
processBlock phase0 250000 vs - 7PWei - maxed ops	214.01 ms/op	213.14 ms/op	1.00
processBlock phase0 250000 vs - 7PWei - average	29.149 ms/op	32.687 ms/op	0.89
epoch phase0 - 250000 vs - 7PWei - beforeProcessEpoch	1.6825 s/op	1.7609 s/op	0.96
epoch phase0 - 250000 vs - 7PWei - processRewardsAndPenalties	782.14 ms/op	755.51 ms/op	1.04
epoch phase0 - 250000 vs - 7PWei - processEffectiveBalanceUpdates	152.95 ms/op	61.139 ms/op	2.50
getAttestationDeltas - 250000 vs - 7PWei	118.60 ms/op	125.78 ms/op	0.94
processSlots - 250000 vs - 7PWei - 32 empty slots	3.3177 s/op	3.5863 s/op	0.93
shuffle list - 16384 els	16.518 ms/op	28.938 ms/op	0.57
shuffle list - 250000 els	236.07 ms/op	419.15 ms/op	0.56
getPubkeys - persistent - req 1000 vs - 250000 vc	19.643 us/op	22.758 us/op	0.86
BLS verify - blst-native	2.1759 ms/op	2.3350 ms/op	0.93
BLS verifyMultipleSignatures 3 - blst-native	4.4720 ms/op	4.7772 ms/op	0.94
BLS verifyMultipleSignatures 8 - blst-native	9.4378 ms/op	10.282 ms/op	0.92
BLS verifyMultipleSignatures 32 - blst-native	34.601 ms/op	37.274 ms/op	0.93
BLS aggregatePubkeys 32 - blst-native	47.442 us/op	52.330 us/op	0.91
BLS aggregatePubkeys 128 - blst-native	182.57 us/op	194.99 us/op	0.94
getAttestationsForBlock	683.96 ms/op	939.44 ms/op	0.73
validate gossip signedAggregateAndProof - struct	5.2961 ms/op	5.6032 ms/op	0.95
validate gossip signedAggregateAndProof - treeBacked	5.2986 ms/op	5.5620 ms/op	0.95
validate gossip attestation - struct	2.5811 ms/op	2.6110 ms/op	0.99
validate gossip attestation - treeBacked	2.5094 ms/op	2.6599 ms/op	0.94

by benchmarkbot/action