feat(stack): implement control flow and checktimelock#2217

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tmpolaczyk wants to merge 10 commits intowitnet:scriptingfrom

tmpolaczyk:scripting-control-flow

Commits on Jun 13, 2022

feat(node): avoid unused call to signature_mngr in BuildScriptTx
tmpolaczyk
committed
feat(stack): remove MyControlFlow enum, use simple Result instead
tmpolaczyk
committed

Commits on Jun 14, 2022

feat(stack): implement CheckSig operator
tmpolaczyk
committed

Commits on Jun 15, 2022

test(stack): add atomic swap use case test
tmpolaczyk
committed

Commits on Jun 20, 2022

test(stack): add another atomic swap test case
tmpolaczyk
committed