gdal_retile.py: resolution handling

[DirkThalheim]

What does this PR do?

This adds an option to gdal_retile for calculating image pyramids for specific resolutions/pixel sizes. This can be used instead of specifying the number of levels. For example: gdal_retile.py -pyramidOnly -ps 4096 4096 -res 1.0,5.0,25.0 -targetDir out/pyramid input/*.tif Will create an image pyramid with

• level 1: 1 m/pixel
• level 2: 5 m/pixel
• level 3: 25 m/pixel (assuming the input data uses as units meter)

What are related issues/pull requests?

Tasklist

• [x] Make sure code is correctly formatted (cf pre-commit configuration)
• [ ] Add test case(s)
• [x] Add documentation
• [ ] Updated Python API documentation (swig/include/python/docs/)
• [ ] Review
• [ ] Adjust for comments
• [ ] All CI builds and checks have passed

Environment

Provide environment details, if relevant:

• OS:
• Compiler:

[rouault]

Existings tests are broken by the changes

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