Merge branch 'stefanozampini/ts-dirk' into 'main'

Diagonally Implicit Runge Kutta

See merge request petsc/petsc!6774

TSDIRK: add docs and python bindings

use TR-BDF2 as default
update documentation

TSDIRK: Diagonally Implicit Runge Kutta

Reuse ARKIMEX code
add additive boolean to the struct
improve code readibility
tweak requirements for identity mass matrix in additive methods
Fix bug in not

TSDIRK: Diagonally Implicit Runge Kutta

Reuse ARKIMEX code
add additive boolean to the struct
improve code readibility
tweak requirements for identity mass matrix in additive methods
Fix bug in not copying last Ydot from previous step in ARKIMEX

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