feat: update gno dependency and add EstimateGas API function #195
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fixes #9
The gno's EstimateGas function takes a signed transition as a parameter. So it's preferable to only create a gnonative wrapper around it instead of making a new argument (aka estimateGas bool) on each kind of function (call, run, send).
So the flow would be that the dapp signs the transition with gnokey-mobile. After signing but before going back to the dapp, gnokey-mobile can show the estimate gas cost to the user, then gnokey-mobile returns also the gas estimation to the dapp which can also show it to the user as a dapp level confirmation before committing the transaction to the blockchain.