cashocs v2.9.0

What's Changed

New Features and Improvements

• Make the formatting of ts_pseudo_solve more like the default PETSc TS monitor by @sblauth in #827
• Enable computation of (nonlinear) residuals for each equation in a system by @sblauth in #842
• Improve handling of mesh tags by @sblauth in #859
• Log optimization problem configuration before solve by @sblauth in #867

Changes to the documentation

• Print arguments on separate lines in the docs by @sblauth in #839

Full Changelog: v2.8.1...v2.9.0