Merge branch 'stefanozampini/snes-kspcg' into 'main'

Updates on SNESNEWTONTR

See merge request petsc/petsc!6216

SNES: support Application context in python code

We keep a global registry for contexts set via Python and cast to object only if SNESGetApplicationContext returns a void* in the set
Otherwise, we r

SNES: support Application context in python code

We keep a global registry for contexts set via Python and cast to object only if SNESGetApplicationContext returns a void* in the set
Otherwise, we return the address

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