sui: add method to create a vaa for testing #13377

Job	Run time
Aptos	2m 59s
cli	2m 34s
algorand	7m 4s
cosmwasm	1m 44s
docker	7s
ethereum	59s
ethereum-upgrade	4m 21s
node	2m 56s
prettier	19s
npm-packages	5s
relayer-ethereum	1m 10s
rust-lint-and-tests (cosmwasm/Cargo.toml)	2m 17s
sdk_vaa	1m 18s
solana	4m 16s
rust-lint-and-tests (terra/Cargo.toml)	1m 40s
spellcheck	14s
rust-lint-and-tests (sdk/rust/Cargo.toml)	39s
Sui	2m 29s
terra	7m 19s
terra-2	9m 46s
wormchain	4m 58s
node-lint	22s
node-tests	24s
tilt	15m 4s
	1h 15m 4s

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