Add Text Generation demo

[ibelem]

This PR added text generation demo with following models:

Name	URL	License	Upstream
Phi-3 Mini 4k Instruct	microsoft/Phi-3-mini-4k-instruct-onnx	MIT	microsoft/Phi-3-mini-4k-instruct
TinyLlama 1.1B Chat v1.0	webnn/TinyLlama-1.1B-Chat-v1.0-onnx	Apache 2.0	TinyLlama/TinyLlama-1.1B-Chat-v1.0
Qwen2 0.5B Instruct	webnn/Qwen2-0.5B-Instruct-onnx	Apache 2.0	Qwen/Qwen2-0.5B-Instruct
DeepSeek R1 Distill Qwen 1.5B	onnxruntime/DeepSeek-R1-Distill-ONNX	MIT	deepseek-ai/DeepSeek-R1-Distill-Qwen-1.5B

Currently, the demo uses the test version of ONNX Runtime Web. We will switch to the dev version once the fix from microsoft/onnxruntime#24437 is included in the NPM packages.

Test URL: https://ibelem.github.io/webnn-developer-preview/demos/text-generation/ , will keep optimizing the performance.
Tested pass on WebNN DirectML GPU backend.

@fdwr PTAL

CC @Honry @huningxin

[fdwr]

Note when trying the demo on Edge (Chromium version 135.0.7049.42, vs 132.0.6831.0 from KNOWN_COMPATIBLE_CHROMIUM_VERSION), I see:

[Honry]

Note when trying the demo on Edge (Chromium version 135.0.7049.42, vs 132.0.6831.0 from KNOWN_COMPATIBLE_CHROMIUM_VERSION), I see:

Float16Array feature may be the root cause. In this demo, we don't fallback Float16Array to Uint16Array. Shall we limit the KNOWN_COMPATIBLE_CHROMIUM_VERSION to newer version?

[ibelem]

@fdwr @Honry

Edge Version	Chromium Version	Test Result
Stable 135.0.3179.85	135.0.7049.96	[Error] TypeError: Failed to execute 'constant' on 'MLGraphBuilder': The buffer view type doesn't match the operand data type.
Beta 136.0.3240.29	136.0.7103.33	PASS
Canary 137.0.3278.0	137.0.7131.0	PASS

Confirmed the WebNN accepted Float16Array for float16 operand type from Chromium build 136.0.7051.0 via source.chromium.org.

Please take a look the doc and code changes for KNOWN_COMPATIBLE_CHROMIUM_VERSION @0bd1952 (#81)

[ibelem]

@fdwr Improved the code in f6f3bf8 for your review comments, thanks a lot!

Updated the ORT dist to dev version which includes microsoft/onnxruntime#24437

PTAL

[fdwr]

Few more.

[fdwr]

Ok, reached end.

[ibelem]

Thanks @fdwr for the further review! Fixed them in 7cdfa06 . PTAL

@Honry Please let's improve the naming (camelCase, whole words, consistent) and format issues carefully together.

[fdwr]

👍😎 demo. Thank you for adding it 👨‍💻.

[ibelem]

Fixed ctrl key name issue in 4b4f337 . Thanks @fdwr !

[fdwr]

👍

[fdwr]

Currently, the demo uses the test version of ONNX Runtime Web. We will switch to the dev version once the fix from microsoft/onnxruntime#24437 is included in the NPM packages.

Can we merge it now, or is there anything to do first (like upload any corresponding models or ORT distributions)?

[ibelem]

Currently, the demo uses the test version of ONNX Runtime Web. We will switch to the dev version once the fix from microsoft/onnxruntime#24437 is included in the NPM packages.

Can we merge it now, or is there anything to do first (like upload any corresponding models or ORT distributions)?

The development version of ORT distributions has been updated in the codebase and verified to be functioning correctly. No additional ORT distributions are required. Please help to merge this PR. Thanks much @fdwr !