Add a new function to loadgen contract for apply load testing. (#1492) #4338

Job	Run time
cargo-deny (advisories)	41s
check-git-rev-deps	7s
cackle	1m 9s
build-and-test (msrv, 22, ubuntu-latest, wasm32-unknown-unknown, false)	9m 14s
cargo-deny (bans licenses sources)	41s
build-and-test (msrv, 22, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	18m 48s
fmt	7s
build-and-test (latest, 22, ubuntu-latest, wasm32-unknown-unknown, false)	10m 51s
semver-checks	4m 39s
build-and-test (latest, 22, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	18m 32s
publish-dry-run (ubuntu-latest, wasm32-unknown-unknown) / publish-dry-run / publish-dry-run	1h 11m 23s
publish-dry-run (ubuntu-latest, x86_64-unknown-linux-gnu) / publish-dry-run / publish-dry-run	1h 11m 11s
complete	1s
	3h 27m 24s

Provide feedback