Export getCosmosGasAmountForMessage and getEVMGasAmountForMessage

[WayneLaw-Crypto]

In some cases, we need to estimate the msg's gas amount to calculate the network fee.
In the recently client sdk version, these two function doesn't export, can you help add this support

[ericHgorski]

Thanks for the report @WayneLaw-Crypto, will export these in the next release.