Introduce receipt depth in broadcast_tx endpoint

[bowenwang1996]

In #9644, we introduced a new rpc endpoint broadcast_tx that allows a user to specify the finality they want to wait for when they submit a transaction. In some use cases such as fungible token transfer, however, it is beneficial to have more granularity in the number of receipts to wait for to ensure the success of ft transfer. In other cases where it involves a chain of cross contract calls, it may be useful to wait for the first few receipts to complete before returning. So it would be nice if we can introduce a new finality level that specifies the number of receipts to wait for in this rpc enpoint to offer more customizability for users. cc @gmilescu