This change updates the Emscripten build to output files named `mujoco.js`, `mujoco.wasm`, and `mujoco.d.ts` instead of `mujoco_wasm.*`. The internal CMake target name remains `mujoco_wasm` to avoid conflicts. The package name in `package.json` is also updated to `mujoco`. New enum tests are added.
PiperOrigin-RevId: 875140314
Change-Id: Ie03e0d1db2d03dd8582d5bfcb260b3d33549c2c9
* All tests moved into wasm/codegen/tests folder
* Merged wasm/codegen/helpers/ into wasm/codegen/generators/
PiperOrigin-RevId: 829471173
Change-Id: I2dbc5d9351771817ec260c7ddf87c31e66a9eabe
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