feat: `dry-run` flag to estimate gas #181

Job	Run time
deny	42s
docker	13m 10s
lint	11s
parachain-integration-tests	39m 33s
contract-integration-tests	10m 10s
build	1m 29s
coverage	2m 44s
unit-tests	2m 28s
	1h 10m 27s

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