[whatwg/webidl] Add [AllowImmutable] extended attribute for immutable array buffers and views (Issue #1487)

anba created an issue (whatwg/webidl#1487)

### What problem are you trying to solve?

<https://github.com/tc39/proposal-immutable-arraybuffer> will likely need a new `[AllowImmutable]` extended attribute, similar to #982 for resizable array buffers. 

### What solutions exist today?

_No response_

### How would you solve it?

_No response_

### Anything else?

See also <https://github.com/tc39/proposal-immutable-arraybuffer/issues/43>.

Proposed structured clone changes: <https://github.com/whatwg/html/pull/11033>.

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