Common: error enum generator should create structures with named fields instead of tuples

[dmitrii-ubskii]

Before:

error_messages! { TypeQLError
    code: "TQL", type: "TypeQL Error",
    SyntaxErrorDetailed(usize, String, String, String) = // unnamed parameters
        3: "There is a syntax error at line {}:\n{}\n{}\n{}", // opaque format string
}

After:

error_messages! { TypeQLError
    code: "TQL", type: "TypeQL Error",
    SyntaxErrorDetailed{ line: usize, text: String, pointer: String, error: String} = // named parameters
        3: "There is a syntax error at line {line}:\n{text}\n{pointer}\n{error}", // string interpolation
}