[whatwg/webidl] Introduce a "detachable" algorithm for BufferSource (PR #1419)

The new "detachable" algorithm allows an invoker to determine if a BufferSource is detachable without errors before invoking transfer. This is particularly helpful if several buffers are processed in a batch, as the validity of the operation can be determined up front, rather than during processing which could leave the buffers in a mix of states.

See discussion in [1]. A local copy of the algorithm was landed as [2] but this seems like a useful addition to WebIDL.

1: https://github.com/webmachinelearning/webnn/issues/351
2: https://webmachinelearning.github.io/webnn/#buffersource-detachable

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1419

-- Commit Summary --

  * Introduce a "detachable" algorithm for BufferSource

-- File Changes --

    M index.bs (15)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1419.patch
https://github.com/whatwg/webidl/pull/1419.diff

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