Option to call out improperly structured queries

[zsherman]

It might be nice in the same way we have a white underline for properly structured queries, to call out malformed tokens with a subtle red underline.

[jsonmaur]

Could be cool. What would constitute a malformed token? I could see a use case where someone is searching for an exact keyword in their logs that contains a colon, so it might look like they're trying to query a token when it's actually just a keyword.

[jsonmaur]

A malformed token may just be when the value doesn't match the attribute type. e.g. http_response.status:hello