[com4]: Add com4 benchmark tests

[PaulaSp3]

Added benchmark data:

• channelled parabola that was used in https://gmd.copernicus.org/articles/15/2423/2022/
• Arzler Alm avalanche

Added a script that run a simulation and compares the results (pixel wise) with reference data.
Comparison results are written into: avaframe/tests/reportsCom4FlowPy/standardTestsReportCom4FlowPy.md
There are many options to extent these comparisons and what we could write into the report (e.g., plot with the difference of the rasters,..)

resolves #1227

PR Checklist

Please confirm before requesting review:

• I ran pytest locally without fails
• I added/updated tests where needed
• I updated documentation where needed

Confirm before the final merge/rebase into master

• Commits are sensibly squashed and rebased onto latest master
• Standardtest run without difference (with recompiled cython code)

[qltysh]

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