1. A new option `show_json_schema` which, when enabled, will print the JSON schema of the command output if the target isn't an ANSI-capable terminal.
2. Some modifications to the help message and error handling for the new option `show_json_schema`.
This is now done to avoid flooding the help screen with an entire
JSON schema. Plus, it makes the schema more easily exportable as an
actual JSON schema.
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