Implement optional Skia codec adapter (#41)

tools/generate_api_shims.py

@@ -38,6 +38,7 @@ TARGETS = {
 # implementations. The generated module keeps catalog markers and re-exports
 # the hand-written type so coverage remains deterministic.
 NATIVE_TYPES = {
+    "T:LibreMetaverse.Imaging.Skia.SkiaTextureCodec": "crate::skia_codec::SkiaTextureCodec",
     "T:LibreMetaverse.Imaging.ManagedImageCreator": "crate::j2k::ManagedImageCreator",
     "T:LibreMetaverse.Imaging.ManagedImageInterleavedExtensions": "crate::j2k::ManagedImageInterleavedExtensions",
     "T:LibreMetaverse.Imaging.Targa": "crate::targa::Targa",