improve error handling in init_chain

[tzemanovic]

there are some unwraps in the init_chain (and possibly other shell's methods?) - ideally these should be propagate up to the method's Result

[tzemanovic]

see anoma/anoma#1099 (comment) which improved the wasm_loader error handling

[cwgoes]

@tzemanovic is this still relevant?

[tzemanovic]

@tzemanovic is this still relevant?

I'd say so, but it's probably not a high priority for now

[tzemanovic]

On a second thought, it's better to crash on any errors than to return the errors back to tendermint as it's clearer to see what happened. With the new genesis #2088 and #2130, we should be able to prevent invalid chain configurations. Any other issues are not recoverable