[whatwg/streams] Introspection: disturbed or locked (#1105)

Fetch has a couple cases where it needs to check whether a stream is disturbed or locked. Is this something that other consumers of Streams need?

For Fetch's Body mixin I plan to introduce a term for this condition: "unusable" (see https://github.com/whatwg/fetch/pull/1155), but it would still be useful to have a term that's applicable to `ReadableStream` objects as well and ideally that name would be shared.

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