Constant bevy::pbr::MESH_PIPELINE_VIEW_LAYOUT_SAFE_MAX_TEXTURES

pub const MESH_PIPELINE_VIEW_LAYOUT_SAFE_MAX_TEXTURES: usize = 10; // 10usize

How many textures are allowed in the view bind group layout (@group(0)) before broader compatibility with WebGL and WebGPU is at risk, due to the minimum guaranteed values for MAX_TEXTURE_IMAGE_UNITS (in WebGL) and maxSampledTexturesPerShaderStage (in WebGPU), currently both at 16.

We use 10 here because it still leaves us, in a worst case scenario, with 6 textures for the other bind groups.

See: https://gpuweb.github.io/gpuweb/#limits