Add --binary flag for info command

[smiasojed]

Closes #800

The combination --binary and --output-json returns JSON:

{ 
  "wasm": "0x..."
}

I assumed that binary flag is a behaviour switch, and output-json just formatter.
The another option is to combine wasm hex code with the rest of info command default content:

{
  "trie_id": "f8ac805216a9318ab898d0777e24ac52583ca690a218556cfeb6b05744d191cf",
  "code_hash": "0x1a56980585ad4097aaea9daf1bee2332e2a9cf579d0c1a3b91a81900cb399a53",
  "storage_items": 1,
  "storage_item_deposit": 100000000000
  "wasm": "0x..."
}

I think that cleaner approach is the first one, where --binary is treated as behaviour switch

[ascjones]

Looks good, just the small nitpick about the return type and a question.

Also please update the description with "Closes #800", so we know which issue is being dealt with and it closes automatically when this is merged.

[ascjones]

Should convert the BoundedVec to a Vec for the return type: better not to expose types generated by subxt in the public api of this crate.

[smiasojed]

Done

[ascjones]

LGTM!