exp: add std.ExecAsPkg

[moul]

Signed-off-by: Manfred Touron 94029+moul@users.noreply.github.com

[loicttn]

This feature would be super useful to create an on-chain multisig where we could have functions like:

// Create a proposal for the quorum and add it to the proposals array
// if sender is not in the current quorum, revert
// if expirationTimestamp is already reached, revert
func CreateProposal(rawTx tx, expirationTimestamp string)

to create a Proposal and store the rawTx in the contract state, and then:

// Execute an approved tx
// if sender is not in the current quorum, revert
func Execute(proposalId string)

where Execute would use a function like std.Exec(rawTx) where rawTx type is

type RawTx struct {
    destination  std.Address
    value            uint64
    data             bytes
}

In Solidity we can do calls like that with destination.call.value(txValue)(txData); it would be nice to have a similar pattern here

[moul]

Btw, recent discussions on #393 and #402 make me think that other people may be interested to find a way to ExecAsPkg.

[moul]

Please share your thoughts on PR #683.

[jaekwon]

There must be a pattern that uses only pure Go/Gno to achieve what we ultimately want.
Please see #566 (comment).
Also see #715 (review).