[BUG] Python interface returns "lp_stats" for QP and SOCP problems

[chris-maes]

1. This should not be called lp_stats since it is valid for more than QP and SOCP
2. We should switch the Python API over to using attributes (similar to the C API) and deprecate these stats.

[github-actions]

🔔 Hi @anandhkb @Iroy30, this issue has had no activity for 21 days. Please update or let us know if it can be closed. Thank you!

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