feat: GDAL 3.8 support

[oleksii-leonov]

Adding support for GDAL 3.8 (and GDAL 3.6, which was not tested previously).

Major changes

Fixes GDAL Grid Options for GDAL 3.6+.

C structures for GDAL Grid Options were changed in GDAL 3.6.0 (and more changes are expected to be added in the next versions).

// https://gdal.org/api/gdal_alg.html#_CPPv426GDALGridDataMetricsOptions

struct GDALGridDataMetricsOptions
//  Public Members
    size_t nSizeOfStructure
//         Added in GDAL 3.6 to detect potential ABI issues. Should be set to sizeof(GDALGridDataMetricsOptions)
    double dfRadius1
//         The first radius (X axis if rotation angle is 0) of search ellipse.
// ...

To handle different GDAL Grid Options C structs for different GDAL versions, I have added LayoutVersionResolver and made minor refactoring for GridAlgorithms.

Minor changes

• In GDAL 3.8, OGR 2.5D factories return 2.5D type geometries for empty geometry (instead of 2D in past versions). This change in GDAL behaviour is now represented in specs.

Breaking changes

None

Note

For the Ubuntu 24.04 GitHub Actions CI I got one flaky spec (randomly failing for any Ruby version; not happening on Ubuntu 20.04 or 22.04):

 Failures:

  1) OGR::DataSource#sync_to_disk 
     Failure/Error:
       OGR::ErrorHandling.handle_ogr_err("Unable to syn datasource to disk") do
         FFI::OGR::API.OGR_DS_SyncToDisk(@c_pointer)
       end

     OGR::Failure:
       Unable to syn datasource to disk
     # ./lib/ogr/data_source.rb:239:in `sync_to_disk'
     # ./spec/unit/ogr/data_source_spec.rb:227:in `block (3 levels) in <top (required)>'

So, some CI runs may fail on Ubuntu 24.04 due to this flaky spec. But I didn't manage to reproduce it easily, so I would prefer to fix it later as a separate PR.

[oleksii-leonov]

@tindron @turboladen

This one is ready to merge.

• Several CI running on Ubuntu 24.04 are failing due to flaky spec. I would prefer to fix it in a separate PR (as it is not related to any changes in this PR).
• We have Ubuntu 24.04 (with custom-compiled GDAL 3.9.0) in production for a month with no issues so far (however, we don't really use OGR as we directly use GEOS via RGeo gem CAPI).