Can't add GeoPackage layer if gpkg_contents extents are invalid

[fhoubie]

GeoPackages provide an informative set of extents for each layer in gpkg_contents. In theory those extents represent a logical view that can be applied after the layer is added. However, if those extents are invalid for any reason (for example, minY and maxX swapped), the layer can't be added at all.

Actual behavior: Invalid Layer: GDAL provider Cannot open GDAL dataset /Users/JeffYutzler/Data/ek7demo/ek7demo.gpkg: Illegal min_x/min_y/max_x/max_y values for osm_tiles (file: src/providers/gdal/qgsgdalprovider.cpp row: 174function QgsGdalProvider Raster layer Provider is not valid (provider: gdal, URI: /Users/JeffYutzler/Data/ek7demo/ek7demo.gpkg (file: src/core/raster/qgsrasterlayer.cpp row: 668function setDataProvider

Expected behavior: Add the layer, just ignore the invalid extents (don't zoom in or anything) and maybe give an informative message.

Linked to ​http://issues.qgis.org/issues/16884#change-80979

[Even Rouault]

In 39645:

GPKG: do not error out if extent in gpkg_contents is present but invalid (fixes #6976)

[Even Rouault]

In 39646:

GPKG: do not error out if extent in gpkg_contents is present but invalid (fixes #6976)

[Even Rouault]

In 39647:

GPKG: do not error out if extent in gpkg_contents is present but invalid (fixes #6976)

[Even Rouault]

In 39648:

GPKG: do not take into account gpkg_contents for the extent of vector layers when it is present but invalid (fixes #6976)

[Even Rouault]

In 39649:

GPKG: do not take into account gpkg_contents for the extent of vector layers when it is present but invalid (fixes #6976)

[Even Rouault]

In 39650:

GPKG: do not take into account gpkg_contents for the extent of vector layers when it is present but invalid (fixes #6976)