feature request: add --token option to cast balance

[fenghaojiang]

Component

Cast

Describe the feature you would like

Currently I use following ways to get erc20 / erc721 balance.

cast call [token_address] "balanceOf(address) returns uint256" --rpc-url=https://rpc.ankr.com/eth

Every time I spend some time to write the method sig params.
IMHO, as erc20 / erc721 become standard and become some common sense rules, I want to make a short cut to get erc20 / erc721 balance.

Like:

c

And I would like to implement it.

Additional context

No response

[Evalir]

@fenghaojiang feel free to go for it! cc @mds1 for ux

[mds1]

The proposed UX of cast balance --token <address> lgtm!

[gakonst]

supportive