Support more 32-bit floating-point pixel format caps on iOS

[lexaknyazev]

It seems that some format caps are not aligned with the Metal docs. However, the docs themselves are not very precise.

• RG32Float and RGBA32Float must support MSAA on Apple7 GPUs and newer.
• R32Float, RG32Float, and RGBA32Float must be filterable and resolvable on Apple7 GPUs and newer if mtlDevice.supports32BitFloatFiltering is true. This configuration includes iPad models with M-series chips, Vision Pro, and iPhone models with A17 Pro. The latter is technically covered by Add: Recognize Apple9 #2107 but it would redundant if the proper detection is implemented.
• RGBA32Float must support blending on Apple7 GPUs and newer if mtlDevice.supports32BitFloatFiltering is true. This is not mentioned in the docs but has been confirmed with the devices.

[billhollings]

PR #2308 should fix these issues. Please retest with that code, and close this issue if the problem is fixed.