[CONTRIB] Stronger typing, better support for { result } type of output

[pretentious7]

Hey,

I'm one of the developers of feather (https://github.com/pretentious7/Feather), I've also been using a small set of mocks to test smartweave contracts with jest. I have better typing support so the output of execute shows up as

export type ContractHandlerOutput =
	| {state: StateInterface}
	| {result: ResultInterface};

Would there be interest in a pr adding this support? Also, project linter specs would be cool.