COIN backend: More basis status and tableau data functions #19471
Description
This is a follow-up to #18763.
It adds the missing get_row_price and get_reduced_cost functions.
These are the remaining functions necessary to implement #18804.
CC: @yuan-zhou @nathanncohen @videlec @dimpase
Component: numerical
Author: Aedi Wang, Wang de Mao
Branch/Commit: cef0fc3
Reviewer: Dima Pasechnik
Issue created by migration from https://trac.sagemath.org/ticket/19471