Print panic message to debug buffer

[athei]

We should print panic messages to the debug buffer when logging is enabled. This will print useful messages to the console and UIs (once they implement it). It looks like this:

panicked at 'encountered error while querying transferred balance: Decode(Error)', /Users/alexander/Developer/parity/ink/crates/lang/src/dispatcher.rs:145:10

Before we consider merging this we must stabilize seal_debug_message.

Depends on: use-ink/cargo-contract#326

[cmichi]

@athei Is there anything left before we can stabilize seal_debug_message in the contracts pallet? From my POV it seems to be working well, I'm not aware of any issues with it.

[athei]

I think it can be stabilized as is. I need to double check whether the weight stuff is sound, though.

[cmichi]

We're waiting for the stabilization of seal_debug_message before merging. Code looks good.

[athei]

paritytech/substrate#9550