This PR adds a new layout mode for images called `raw`, as discussed with the core team a while back. This mode has the following characteristics:
- No wrapper `span` around the `img` element
- No sizer svg
- Almost no styles automatically added to the `img` element
- `style` parameter is allowed and is passed through to the underlying `img` element
This also adds documentation changes to describe the new component.
There are a few tradeoffs and DX decisions that may warrant discussion/revision before merging. I'll add a few comments to highlight those issues.
- Related to #18637
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