Function validate_json 

pub fn validate_json(
    content: &str,
    _filename: String,
    _context_lines: usize,
) -> Result<()>

validate json content and return errors with diagnostics

args

• content - the json content to validate
• _filename - the filename (for error reporting)
• _context_lines - number of context lines to show (reserved for future use)

returns

• Ok(()) if the json is valid
• Err(miette::Report) with diagnostics if invalid