WebGPU support

Problem/Motivation

WebGPU enables to run local AI directly in the browser with nothing to setup.

Previously 📌 Ollama LLM Provider Active I wrote "people show demand to experiment with local AI [...] Another question is how to make it easy enough and accessible to regular Drupal CMS users. How does one install it on the server actually. How much knowledge, investment and experience does it require to do it in the proper way."

With WebGPU there is only one requirement:
to have good enough graphics card by the site user.

And AI runs on user machine itself (web browser).

Proposed resolution

Libraries:

• https://github.com/mlc-ai/web-llm

Remaining tasks

User interface changes

API changes

Data model changes