Disable custom wasm code execution in the RPC

[sug0]

• Disable custom wasm execution in dry ran txs.
• Remove TxCustom from the sdk args.

[cwgoes]

@Fraccaman to ask @sug0

[sug0]

@cwgoes @Fraccaman this issue was created before we had gas metering at the instruction level in wasm. this allowed you to submit transactions with infinite loops, DoSing the node you submitted the tx to; now, you'll eventually run out of gas, when dry running a tx with an infinite loop. I think it's fine to allow the execution of arbitrary wasms in the RPC, which might be useful to estimate the gas cost of a governance proposal. most nodes will probably want to disable this functionality, though, since it might have a significant CPU cost

[Fraccaman]

perfect thanks! Ill close this :)