Add SU2_MON history file monitor - #2988

Proposed Changes

Give a brief overview of your contribution here in a few sentences.

SU2_MON, a python based monitor to view residuals, in case you do not want to view the real time residuals in paraview.
[and my most recent pre-commit is also fixing a bunch of empty lines in unrelated python files]

PR Checklist

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• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• I used the pre-commit hook to prevent dirty commits and used pre-commit run --all to format old commits.
• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.