[Merged by Bors] - Add MSAA to new renderer #3042
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Adds support for MSAA to the new renderer. This is done using the new pipeline specialization support to specialize on sample count. This is an alternative implementation to #2541 that cuts out the need for complicated render graph edge management by moving the relevant target information into View entities. This reuses @superdump's clever MSAA bitflag range code from #2541.
Note that wgpu currently only supports 1 or 4 samples due to those being the values supported by WebGPU. However they do plan on exposing ways to enable/query for natively supported sample counts. When this happens we should integrate