Return rich object + print method

[moodymudskipper]

We want to return a list with a class "constructive"
It prints as it does now.
It contains :

• a code item (character vector)
• a waldo_compare item that contains the result of the comparison

The print method uses styler but users can fetch the code element and do what they want.
The waldo_compare element is used by construct_issues and to display a summary of the issues. If we have environment issues, secret issues, attribute issues, I'd like the summary just to mention it and no other detail.

construct() will update the globals$last_construct variable, which will be used by construct_issues() by default.

[github-actions]

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