WebGPU Device Limits

[unfolding18]

Is your feature request related to a problem? Please describe.
When compiling to WebGPU, you cannot specify device limits beyond the default limits provided by the implementation - for example, if you wish to request that the max_storage_buffer_binding_size limit be increased. Currently, any user-defined limits are simply ignored, as seen here: https://github.com/gfx-rs/wgpu/blob/master/wgpu/src/backend/web.rs#L1237

Additional context
After some discussion with several users on Matrix, it seems that the issue stems from the fact that web-sys doesn't have any bindings for setting the limits in https://docs.rs/web-sys/latest/web_sys/struct.GpuDeviceDescriptor.html

The struct contains a member that is record<DOMString, GPUSize64> requiredLimits, which apparently is where the problem starts (record<> is not supported by web-sys?). Maybe others can chime in with additional context here.

[FL33TW00D]

This was fixed with a polyfill for record in: #4107