[Bug] state changeset arg breaks compatibility with certain endpoints

[klkvr]

Component

network, json-rpc, rpc

What version of Alloy are you on?

No response

Operating System

None

Describe the bug

State changeset arg is not a part of specification, and is not supported by all client implementations. currently it is always being included as a third argument in eth_call which is incorrect for some of the endpoints

ref foundry-rs/foundry#7954 and foundry-rs/foundry#7943

we should probably only include it into the request payload if it's not empty

[DaniPopes]

#763 did not fix this. Fixed with #778.