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Add ASTC compressed format support across multiple backends. (#680)

* Add ASTC compressed format support across multiple backends.

* Enhance ASTC compressed texture support across Metal and WGPU.

* Handle block-aligned offsets and sizes correctly
* Gate Metal BC/ASTC support on actual device capabilities
* Add ASTC format coverage and NPOT mip texture tests

* Simplify the test case for ASTC texture formats.

* Enhance texture copy and upload tests for compressed formats across multiple backends

* Fix code format with pre-commit

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Co-authored-by: Simon Kallweit <64953474+skallweitNV@users.noreply.github.com>

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