Rename crate_ops to extensions (#10431)

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+# deno_webgpu
+
+This op crate implements the WebGPU API as defined in
+https://gpuweb.github.io/gpuweb/ in Deno. The implementation targets the spec
+draft as of February 22, 2021. The spec is still very much in flux. This op
+crate tries to stay up to date with the spec, but is constrained by the features
+implemented in our GPU backend library [wgpu](https://github.com/gfx-rs/wgpu).
+
+The spec is still very bare bones, and is still missing many details. As the
+spec becomes more concrete, we will implement to follow the spec more closely.
+
+In addition, setting the `DENO_WEBGPU_TRACE` environmental variable will output
+a
+[wgpu trace](https://github.com/gfx-rs/wgpu/wiki/Debugging-wgpu-Applications#tracing-infrastructure)
+to the specified directory.
+
+For testing this op crate will make use of the WebGPU conformance tests suite,
+running through our WPT runner. This will be used to validate implementation
+conformance.
+
+GitHub CI doesn't run with GPUs, so testing relies on software like DX WARP &
+Vulkan lavapipe. Currently only using DX WARP works, so tests are only run on
+Windows.
+
+## Links
+
+Specification: https://gpuweb.github.io/gpuweb/
+
+Design documents: https://github.com/gpuweb/gpuweb/tree/main/design
+
+Conformance tests suite: https://github.com/gpuweb/cts
+
+WebGPU examples for Deno: https://github.com/crowlKats/webgpu-examples
+
+wgpu-users matrix channel: https://matrix.to/#/#wgpu-users:matrix.org