Track and show input argument for chain state lookup

[apopiak]

I love the "Chain state" lookup tab for letting me check the current state of places in storage (e.g. the balances of accounts). I cannot distinguish visually between different instances of the same storage map though (this only an issue for maps). (the two chain states are different, but it is unclear which key they correspond to)

Feature request: show the arguments used to access the chain state in the fields showing the state.