Move tile transforms handling cache to TileData

[groud]

This PR does multiple things:

• moves the transformed polygons data cache to the TileData object. Since it's part of the TileSet resource, that should avoid further errors like Painting a rotated or flipped tile in a Tilemap loses collision #83825. It reverts Fix rotated tile collision not working at runtime #84261 and fix the issue in a cleaner way.
• Fix some errors that would be printed when using occluders. We were storing invalid occlusion polygons in the TileSet which caused errors to be printed.
• Fixed baking NavigationRegions with rotated tiles (an island is collision shapes, the other in navigation polygons, both work):
  

Bugsquad edit: Fixes #83825

[dsnopek]

I only looked at the GDExtension compatibility changes, but those look good to me!

[AThousandShips]

Looks correct otherwise

[KoBeWi]

I added some minor optimization suggestions (they apply to physics and navigation too ofc), but otherwise looks fine.

[AThousandShips]

Missed in docs

[groud]

Thanks for the feedback @kleonc and @AThousandShips, should be fixed now :)

[kleonc]

Haven't tested, just looked at the code changes, LGTM!

[YuriSizov]

@groud Could you address the comment above and do the rebase? Otherwise this seems to be good to go based on reviews.

[YuriSizov]

Still has conflicts 🙃

[groud]

@groud Could you address the comment above and do the rebase? Otherwise this seems to be good to go based on reviews.

Done.

Still has conflicts 🙃

Yeah, sorry for that, I forgot to rebase.

[YuriSizov]

Thanks!