Improvement to public inputs in contract

[sebastiantf]

Description

The publicInputs input to the contract is taken as an array. But its not a homogenous array. The expected public inputs are: user leaf hash, MST root followed by root balances:

summa-solvency-schneier/contracts/src/Summa.sol

Lines 188 to 197 in 95d63fe

	/**
	* Verify the proof of user inclusion into the liabilities tree
	* @param proof ZK proof
	* @param publicInputs proof inputs
	*/
	function verifyInclusionProof(
	bytes memory proof,
	uint256[] memory publicInputs,
	uint256 timestamp
	) public view returns (bool) {

Since they are not homogenous or not values that have the same meaning, it might be better DX/UX to have them as separate meaningful inputs and combine them into an array within the function before submitting them to the verifier. eg. how the zkDrops contract does it: https://github.com/a16z/zkdrops/blob/a4e58bdad8391ffc133c3643c449be5d18b69832/zkdrops-contracts/contracts/PrivateAirdrop.sol#L42-L46