feat: add `gossipFactor` parameter to `GossipsubOpts` #764

Job	Run time
check	37s
test-chrome	1m 34s
test-node-e2e (ubuntu-latest, lts/*)	5m 28s
test-firefox	1m 35s
test-node (windows-latest, lts/*)	1m 49s
test-node (ubuntu-latest, lts/*)	1m 22s
test-node (macos-latest, lts/*)	59s
release	0s
	13m 24s

Provide feedback