Allow fee estimation for declare and deploy transactions

[FabijanC]

Currently new classes can be declared with a supplied max fee. But a fee cannot be estimated:

account.declare(contractFactory, { maxFee: ... });

This is how we do it for invokes:

const feeEstimation = account.estimateFee(contract, "foo", { arg1: ... });
account.invoke(contract, "foo", { arg1: ... }, { maxFee: ... });

Could look like:

account.estimateDeclareFee(contractFactory, ...);
account.estimateDeployFee(contractFactory, ...);

[FabijanC]

Also: do the estimation implicitly (can we just copy the workflow from invoking?)