Enable printing ClusterExpansion as a latex table about smol HOT 1 OPEN

Thanks @qchempku2017. I think this should be handled as two different things:

1. exporting latex tables (with any decimal precision you want). I suggest this not be hard-coded into the source since it is not a critical functionality, but simply convenience for some people, and IMO will just add bloat to the code making maintenance and testing harder. As an alternative, I suggest writing an independent function that does that for you, and if you want to share it (bc some people will likely benefit from that), then add it in an example notebook.
2. If the current decimal precision used in the "pretty string" is not enough, then we simply need to update it to one that is.

from smol.