[in3Utils/out3Plot] Generic debris-flow topography

[JuLa96]

add function debrisFlowTopoAverage in in3Utils/generateTopo.py to calculate a generic topography for debris-flow simulations

Update in3Utils/generateTopo.py
Update out3Plot/outTopo.py

[qltysh]

Coverage Impact

⬇️ Merging this pull request will decrease total coverage on master by 0.24%.

Modified Files with Diff Coverage (1)

Rating	File	% Diff	Uncovered Line #s
	avaframe/in3Utils/generateTopo.py	2.2%	295-793
	Total	2.2%

🤖 Increase coverage with AI coding...

In the `genericTopoDebrisFrame` branch, add test coverage for this new code:

- `avaframe/in3Utils/generateTopo.py` -- Line 295-793

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[JuLa96]

This PR is shifted to OpenNHM/DebrisFrame#54