[whatwg/dom] Make some ShadowRoot attributes mutable (Issue #1252)

### What is the issue with the DOM Standard?

See https://github.com/whatwg/html/issues/10107 for context.

But some fields of `ShadowRoot` feel like they could easily be made mutable:
- `delegatesFocus`
- `clonable`
- `serializable` (hopefully [coming soon](https://github.com/whatwg/html/issues/8867#issuecomment-1856696628))

Others might be more difficult or not desirable:
- `mode`
- `slotAssignment`
- `host`

Should the first set be made mutable?

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