Add python implementation for wgsl-gen

[danielsongmicrosoft]

Description

Replaces the npm-based @fs-eire/wgsl-template Node.js engine used by the WebGPU EP's static build path with an in-tree, stdlib-only Python implementation under wgsl_templates. The dynamic generator path is unchanged.

Motivation and Context

[guschmue]

I think this should move to tools/python/

[danielsongmicrosoft]

Did some manual testing for confirmation:

• Built ORT with --use_webgpu --wgsl_template static --config RelWithDebInfo
  • I believe this exercises the new py tool against all 27 in-tree .wgsl.template files and c++ compiler accepted it
• Ran onnxruntime_provider_test.exe with GTX 1060 6GB (what I have on my dev box) for Pad, Transpose, and Conv operator suites.
  • 317/318 tests passed, the 1 failure was due to an fp16 compatibility issue with my GPU

[danielsongmicrosoft]

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