option to enable lint python codeblocks

it's great that the formatter now formats python codeblocks in docstrings and markdown files, but i don't like how it just silently leaves blocks unformatted if they contain a syntaax error

it would be nice if ruff reported a syntax error in such docstrings. an option to also report lint rules inside them would be nice too, although it would probably need to be configureable as i can imagine there are some rules users wouldn't care about in codeblocks.