[processing] Brand new generate elevation profile image algorithm

[nirvn]

Description

This PR adds a brand new generate elevation profile image algorithm to the processing toolbox:

This can come in super handy as part of models that need to output elevation profiles for multiple curves.

I've tried to find a balance in picking the parameters exposed here. There would be plenty more to do, but unsure how much further we should go :)

By default, the algorithm will set the elevation profile plot's distance (X axis) and elevation (Y axis)'s minimum and maximum to match the curve length and Z range of the rendered layers. Users can manually overwrite these set via advanced parameters:

[github-actions]

🪟 Windows builds

Download Windows builds of this PR for testing.
Debug symbols for this build are available here.
(Built from commit a23d131)

🪟 Windows Qt6 builds

Download Windows Qt6 builds of this PR for testing.
(Built from commit a23d131)

[nyalldawson]

We should use the same logic as QgsLayoutToImageAlgorithm to set the file filters here

[github-actions]

Tests failed for Qt 5

One or more tests failed using the build from commit 6ba10d4

generate_elevation_profile (generateElevationProfileImage)

generate_elevation_profile

Test failed at generateElevationProfileImage at tests/src/analysis/testqgsprocessingalgspt2.cpp:1992

Rendered image did not match tests/testdata/control_images/processing_algorithm/expected_generate_elevation_profile/expected_generate_elevation_profile.png (found 21082 pixels different)

The full test report (included comparison of rendered vs expected images) can be found here.

Further documentation on the QGIS test infrastructure can be found in the Developer's Guide.

[github-actions]

Tests failed for Qt 6

One or more tests failed using the build from commit 6ba10d4

generate_elevation_profile (generateElevationProfileImage)

generate_elevation_profile

Test failed at generateElevationProfileImage at tests/src/analysis/testqgsprocessingalgspt2.cpp:1992

Rendered image did not match tests/testdata/control_images/processing_algorithm/expected_generate_elevation_profile/expected_generate_elevation_profile.png (found 28482 pixels different)

The full test report (included comparison of rendered vs expected images) can be found here.

Further documentation on the QGIS test infrastructure can be found in the Developer's Guide.

[qgis-bot]

@nirvn

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[qgis-bot]

@nirvn
This pull request has been tagged as requiring documentation.

A documentation ticket will be opened at https://github.com/qgis/QGIS-Documentation when this PR is merged.

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[qgis-bot]

@nirvn
A documentation ticket has been opened at qgis/QGIS-Documentation#9379
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