PETSc clean up

[ZoeLeibowitz]

Replaces #2724

[codecov]

Codecov Report

❌ Patch coverage is 22.10611% with 969 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.32%. Comparing base (a19f136) to head (7053209).
⚠️ Report is 1 commits behind head on petsc.

Files with missing lines	Patch %	Lines
devito/petsc/iet/callbacks.py	16.55%	373 Missing ⚠️
tests/test_petsc.py	9.57%	255 Missing ⚠️
devito/petsc/iet/builder.py	14.28%	102 Missing ⚠️
devito/petsc/iet/type_builder.py	22.35%	66 Missing ⚠️
devito/petsc/iet/solve.py	24.24%	50 Missing ⚠️
devito/petsc/iet/time_dependence.py	34.66%	49 Missing ⚠️
devito/petsc/iet/passes.py	43.10%	31 Missing and 2 partials ⚠️
devito/petsc/config.py	55.31%	20 Missing and 1 partial ⚠️
devito/petsc/solve.py	45.45%	12 Missing ⚠️
devito/petsc/types/metadata.py	40.00%	3 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##            petsc    #2740      +/-   ##
==========================================
- Coverage   84.46%   84.32%   -0.14%     
==========================================
  Files         269      273       +4     
  Lines       52832    52993     +161     
  Branches     4472     4477       +5     
==========================================
+ Hits        44622    44686      +64     
- Misses       7440     7535      +95     
- Partials      770      772       +2     

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