[pyOpenSci review] make Text a subclass of str instead of a single attribute dataclass

[rich-iannone]

From the pyOpenSci comment:

suggestion (_text.py): Maybe we could make Text a subclass of str instead of a single attribute dataclass. We would get rid of quite a few types checks errors.

pyOpenSci/software-submission#202 (comment)

[machow]

We have changed this to now use an interface called BaseText, with only .to_html() and .to_latex() methods.

The interface now only requires these methods, and does not specify what data / attributes the class should hold. I think this gets back at what the reviewer noted -- with the twist that now our interface now doesn't have opinions on how an object is instantiated.