feat: add `gossipFactor` parameter to `GossipsubOpts` (#502) #765

Job	Run time
check	37s
test-chrome	1m 30s
test-node (windows-latest, lts/*)	1m 49s
test-firefox	1m 39s
test-node (ubuntu-latest, lts/*)	1m 25s
test-node (macos-latest, lts/*)	1m 2s
test-node-e2e (ubuntu-latest, lts/*)	5m 13s
release	26s
	13m 41s

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