feat(cast): Call batching support in cast

[legion2002]

Allows users to do multicalls natively on Tempo, in a gas efficient way, without going through some multicall contract.

We can either add something like cast call-batch and cast send-batch etc.

But ideally we are able to add a --batch flag for all tx broadcast related cast commands, which skips taking in the to and data values, and instead takes in a vec<Call> tuple

We can also update the cast mktx command,but I am not sure how many people use this.