Check chunk grid shape consistent upon ManifestArray init

[TomNicholas]

Addresses this TODO:

https://github.com/zarr-developers/VirtualiZarr/blob/2e0b22822b51f1a9c8cbe08c791289e1fce895c3/virtualizarr/manifests/array.py#L67

I noticed that this should be disallowed while debugging https://github.com/zarr-developers/VirtualiZarr/issues/728#issuecomment-3110221034.

Funnily though this breaks some other tests, which potentially need to be changed to not create invalid ManifestArrays.

• [x] Tests added
• [ ] Tests passing
• [x] Full type hint coverage
• [ ] Changes are documented in docs/releases.rst
• [ ] ~~New functions/methods are listed in api.rst~~
• [ ] New functionality has documentation