Add fork as a host function #4454

Job	Run time
cli-tests	15m 33s
integration-tests	19m 53s
build-and-test	15m 0s
docker-targets-build (${{ matrix.platform.platform }})	0s
Publish binaries of ${{ matrix.project }}	0s
sharding-tests	10m 38s
wasm-rpc-stub	1m 16s
worker-tests-group1	6m 58s
docker-publish	0s
worker-tests-group2	3m 21s
worker-tests-group3	4m 37s
worker-tests-group4	6m 1s
worker-tests-group5	7m 44s
worker-tests-group6	17m 0s
worker-tests-group7	6m 6s
worker-tests-group8	12m 35s
publish	0s
publish-slack-notification	0s
	2h 6m 42s

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