Plug memory leaks and free resources on shutdown (llama/19315)

Plug memory leaks and free resources on shutdown (llama/19315)

* Fix memory leaks in shader lib, backend, backend_context, buffer_context, and webgpu_buf_pool

* Free pools

* Cleanup

* More cleanup

* Run clang-format

* Fix arg-parser and tokenizer test errors that free an unallocated buffer

* Fix device lost callback to not print on device teardown

* Fix include and run clang-format

* remove unused unused

* Update binary ops

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Co-authored-by: Reese Levine <redacted>