[Feature Request] Bitnet support

### Describe the feature request

Bitnet support
https://github.com/microsoft/bitnet

### Describe scenario use case

Bitnet replaces heavy floating-point multiplications with simple additions, allowing large language models to run on standard CPUs with a tiny memory footprint and massive energy savings

### Customer requirement and impact

Bigger audience to use AI & massive energy savings.

Start by reviewing the linked microsoft/bitnet project and the foundry-local repository to determine the expected integration boundary. The issue names no files, entry points, tests, or acceptance criteria, so confirm how Bitnet support should work and what successful support must cover before implementation.

Written by the indexing model from the issue text.